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21221032100 = 2252877241973
BaseRepresentation
bin10011110000110111…
…110100000010100100
32000202221010010101212
4103300313310002210
5321430041011400
613425424210552
71350606540152
oct236067640244
960687103355
1021221032100
118aaa7a0564
124142a69a58
132002654238
14105452c3d2
1584305d335
hex4f0df40a4

21221032100 has 36 divisors (see below), whose sum is σ = 46102338324. Its totient is φ = 8478698880.

The previous prime is 21221032097. The next prime is 21221032111. The reversal of 21221032100 is 123012212.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 77545636 + 21143486464 = 8806^2 + 145408^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33287 + ... + 208686.

It is an arithmetic number, because the mean of its divisors is an integer number (1280620509).

Almost surely, 221221032100 is an apocalyptic number.

21221032100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21221032100 is an abundant number, since it is smaller than the sum of its proper divisors (24881306224).

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

21221032100 is a wasteful number, since it uses less digits than its factorization.

21221032100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242864 (or 242857 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21221032100 its reverse (123012212), we get a palindrome (21344044312).

The spelling of 21221032100 in words is "twenty-one billion, two hundred twenty-one million, thirty-two thousand, one hundred".

Divisors: 1 2 4 5 10 20 25 50 100 877 1754 3508 4385 8770 17540 21925 43850 87700 241973 483946 967892 1209865 2419730 4839460 6049325 12098650 24197300 212210321 424420642 848841284 1061051605 2122103210 4244206420 5305258025 10610516050 21221032100