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21666844794232 = 231119235310630549
BaseRepresentation
bin1001110110100101101001…
…00101100101110101111000
32211201022220200000100212201
410323102310211211311320
510314442144231403412
6114025335554515544
74364243420011651
oct473226445456570
984638820010781
1021666844794232
1169a394803a820
12251b21a595bb4
13c12236a6a651
1454c9764b6528
1527890ea79e57
hex13b4b4965d78

21666844794232 has 128 divisors (see below), whose sum is σ = 49597894080000. Its totient is φ = 8756169776640.

The previous prime is 21666844794193. The next prime is 21666844794239. The reversal of 21666844794232 is 23249744866612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21666844794239) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3277107 + ... + 7353442.

It is an arithmetic number, because the mean of its divisors is an integer number (387483547500).

Almost surely, 221666844794232 is an apocalyptic number.

21666844794232 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21666844794232 is an abundant number, since it is smaller than the sum of its proper divisors (27931049285768).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21666844794232 is a wasteful number, since it uses less digits than its factorization.

21666844794232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10630661 (or 10630657 counting only the distinct ones).

The product of its digits is 167215104, while the sum is 64.

The spelling of 21666844794232 in words is "twenty-one trillion, six hundred sixty-six billion, eight hundred forty-four million, seven hundred ninety-four thousand, two hundred thirty-two".

Divisors: 1 2 4 8 11 19 22 23 38 44 46 53 76 88 92 106 152 184 209 212 253 418 424 437 506 583 836 874 1007 1012 1166 1219 1672 1748 2014 2024 2332 2438 3496 4028 4664 4807 4876 8056 9614 9752 11077 13409 19228 22154 23161 26818 38456 44308 46322 53636 88616 92644 107272 185288 254771 509542 1019084 2038168 10630549 21261098 42522196 85044392 116936039 201980431 233872078 244502627 403960862 467744156 489005254 563419097 807921724 935488312 978010508 1126838194 1615843448 1956021016 2221784741 2253676388 2689528897 4443569482 4507352776 4645549913 5379057794 6197610067 8887138964 9291099826 10704962843 10758115588 12395220134 12958639231 17774277928 18582199652 21409925686 21516231176 24790440268 25917278462 37164399304 42819851372 49580880536 51101049043 51834556924 85639702744 102202098086 103669113848 117754591273 142545031541 204404196172 235509182546 246214145389 285090063082 408808392344 471018365092 492428290778 570180126164 942036730184 984856581556 1140360252328 1969713163112 2708355599279 5416711198558 10833422397116 21666844794232