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21423304420 = 22574116722349
BaseRepresentation
bin10011111100111011…
…011010111011100100
32001022000201121212021
4103330323122323210
5322333331220140
613501451432524
71355614040320
oct237473327344
961260647767
1021423304420
1190a3995771
12419a755744
1320355258bb
141073342980
15855bb5b4a
hex4fcedaee4

21423304420 has 96 divisors (see below), whose sum is σ = 52987737600. Its totient is φ = 7122754560.

The previous prime is 21423304411. The next prime is 21423304421. The reversal of 21423304420 is 2440332412.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21423304421) 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, 947406 + ... + 969754.

It is an arithmetic number, because the mean of its divisors is an integer number (551955600).

Almost surely, 221423304420 is an apocalyptic number.

21423304420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21423304420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26493868800).

21423304420 is an abundant number, since it is smaller than the sum of its proper divisors (31564433180).

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

21423304420 is a wasteful number, since it uses less digits than its factorization.

21423304420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22573 (or 22571 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 25.

Adding to 21423304420 its reverse (2440332412), we get a palindrome (23863636832).

The spelling of 21423304420 in words is "twenty-one billion, four hundred twenty-three million, three hundred four thousand, four hundred twenty".

Divisors: 1 2 4 5 7 10 14 20 28 35 41 70 82 140 164 167 205 287 334 410 574 668 820 835 1148 1169 1435 1670 2338 2870 3340 4676 5740 5845 6847 11690 13694 22349 23380 27388 34235 44698 47929 68470 89396 95858 111745 136940 156443 191716 223490 239645 312886 446980 479290 625772 782215 916309 958580 1564430 1832618 3128860 3665236 3732283 4581545 6414163 7464566 9163090 12828326 14929132 18326180 18661415 25656652 26125981 32070815 37322830 52251962 64141630 74645660 104503924 128283260 130629905 153023603 261259810 306047206 522519620 612094412 765118015 1071165221 1530236030 2142330442 3060472060 4284660884 5355826105 10711652210 21423304420