21620473724660 has 48 divisors (see below), whose sum is σ = 45495701637120. Its totient is φ = 8630533676160.

The previous prime is 21620473724657. The next prime is 21620473724669. The reversal of 21620473724660 is 6642737402612.

It is a junction number, because it is equal to n+sod(n) for n = 21620473724599 and 21620473724608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21620473724669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 144552515 + ... + 144702005.

It is an arithmetic number, because the mean of its divisors is an integer number (947827117440).

Almost surely, 2^{21620473724660} is an apocalyptic number.

21620473724660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21620473724660 is an abundant number, since it is smaller than the sum of its proper divisors (23875227912460).

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

21620473724660 is a wasteful number, since it uses less digits than its factorization.

21620473724660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164216 (or 164214 counting only the distinct ones).

The product of its (nonzero) digits is 4064256, while the sum is 50.

The spelling of 21620473724660 in words is "twenty-one trillion, six hundred twenty billion, four hundred seventy-three million, seven hundred twenty-four thousand, six hundred sixty".