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21012211110 = 23511833832003
BaseRepresentation
bin10011100100011011…
…001110010110100110
32000020101011220212010
4103210123032112212
5321013111223420
613353004335050
71342462563462
oct234433162646
960211156763
1021012211110
118a02933230
1240a4b44486
131c9b2cbc17
1410348d14a2
1582ea604e0
hex4e46ce5a6

21012211110 has 128 divisors (see below), whose sum is σ = 55849844736. Its totient is φ = 5016851840.

The previous prime is 21012211081. The next prime is 21012211127. The reversal of 21012211110 is 1111221012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 10489369 + ... + 10491371.

It is an arithmetic number, because the mean of its divisors is an integer number (436326912).

Almost surely, 221012211110 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21012211110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27924922368).

21012211110 is an abundant number, since it is smaller than the sum of its proper divisors (34837633626).

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

21012211110 is a wasteful number, since it uses less digits than its factorization.

21012211110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2490.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21012211110 its reverse (1111221012), we get a palindrome (22123432122).

The spelling of 21012211110 in words is "twenty-one billion, twelve million, two hundred eleven thousand, one hundred ten".

Divisors: 1 2 3 5 6 10 11 15 22 30 33 55 66 83 110 165 166 249 330 383 415 498 766 830 913 1149 1245 1826 1915 2003 2298 2490 2739 3830 4006 4213 4565 5478 5745 6009 8426 9130 10015 11490 12018 12639 13695 20030 21065 22033 25278 27390 30045 31789 42130 44066 60090 63195 63578 66099 95367 110165 126390 132198 158945 166249 190734 220330 317890 330495 332498 349679 476835 498747 660990 699358 767149 831245 953670 997494 1049037 1534298 1662490 1748395 1828739 2098074 2301447 2493735 3496790 3657478 3835745 4602894 4987470 5245185 5486217 7671490 8438639 9143695 10490370 10972434 11507235 16877278 18287390 23014470 25315917 27431085 42193195 50631834 54862170 63673367 84386390 126579585 127346734 191020101 253159170 318366835 382040202 636733670 700407037 955100505 1400814074 1910201010 2101221111 3502035185 4202442222 7004070370 10506105555 21012211110