21625905180 has 48 divisors (see below), whose sum is σ = 66057312384. Its totient is φ = 5242643520.

The previous prime is 21625905167. The next prime is 21625905229. The reversal of 21625905180 is 8150952612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16382602 + ... + 16383921.

It is an arithmetic number, because the mean of its divisors is an integer number (1376194008).

Almost surely, 2^21625905180 is an apocalyptic number.

21625905180 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21625905180 is an abundant number, since it is smaller than the sum of its proper divisors (44431407204).

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

21625905180 is a wasteful number, since it uses less digits than its factorization.

21625905180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32766546 (or 32766544 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 39.

The spelling of 21625905180 in words is "twenty-one billion, six hundred twenty-five million, nine hundred five thousand, one hundred eighty".