21122516605020 has 24 divisors (see below), whose sum is σ = 59143046494224. Its totient is φ = 5632671094656.

The previous prime is 21122516604967. The next prime is 21122516605033. The reversal of 21122516605020 is 2050661522112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 176020971649 + ... + 176020971768.

It is an arithmetic number, because the mean of its divisors is an integer number (2464293603926).

Almost surely, 2^{21122516605020} is an apocalyptic number.

21122516605020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21122516605020 is an abundant number, since it is smaller than the sum of its proper divisors (38020529889204).

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

21122516605020 is a wasteful number, since it uses less digits than its factorization.

21122516605020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352041943429 (or 352041943427 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 33.

The spelling of 21122516605020 in words is "twenty-one trillion, one hundred twenty-two billion, five hundred sixteen million, six hundred five thousand, twenty".