21621223632516 has 96 divisors (see below), whose sum is σ = 52237665849600. Its totient is φ = 6952090736640.

The previous prime is 21621223632511. The next prime is 21621223632563. The reversal of 21621223632516 is 61523632212612.

It is a super-2 number, since 2×21621223632516² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21621223632511) 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, 2177578240 + ... + 2177588168.

It is an arithmetic number, because the mean of its divisors is an integer number (544142352600).

Almost surely, 2^{21621223632516} is an apocalyptic number.

It is an amenable number.

21621223632516 is an abundant number, since it is smaller than the sum of its proper divisors (30616442217084).

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

21621223632516 is a wasteful number, since it uses less digits than its factorization.

21621223632516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15149 (or 15147 counting only the distinct ones).

The product of its digits is 311040, while the sum is 42.

The spelling of 21621223632516 in words is "twenty-one trillion, six hundred twenty-one billion, two hundred twenty-three million, six hundred thirty-two thousand, five hundred sixteen".