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BaseRepresentation
bin10100001000101101…
…111111110011001100
32001210210221021212101
4110020231333303030
5323240001041022
613533235244444
71363535263663
oct241055776314
961723837771
1021621112012
119195610515
124234a49724
1320674c3006
141091713dda
1586823a627
hex508b7fccc

21621112012 has 12 divisors (see below), whose sum is σ = 37973543440. Its totient is φ = 10771528176.

The previous prime is 21621112001. The next prime is 21621112039. The reversal of 21621112012 is 21021112612.

Adding to 21621112012 its reverse (21021112612), we get a palindrome (42642224624).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9755712 + ... + 9757927.

Almost surely, 221621112012 is an apocalyptic number.

It is an amenable number.

21621112012 is a deficient number, since it is larger than the sum of its proper divisors (16352431428).

21621112012 is a wasteful number, since it uses less digits than its factorization.

21621112012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19513920 (or 19513918 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 19.

The spelling of 21621112012 in words is "twenty-one billion, six hundred twenty-one million, one hundred twelve thousand, twelve".