21634028580 has 24 divisors (see below), whose sum is σ = 60575280192. Its totient is φ = 5769074272.

The previous prime is 21634028579. The next prime is 21634028587. The reversal of 21634028580 is 8582043612.

It is not an unprimeable number, because it can be changed into a prime (21634028587) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 180283512 + ... + 180283631.

It is an arithmetic number, because the mean of its divisors is an integer number (2523970008).

Almost surely, 2^21634028580 is an apocalyptic number.

21634028580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21634028580 is an abundant number, since it is smaller than the sum of its proper divisors (38941251612).

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

21634028580 is a wasteful number, since it uses less digits than its factorization.

21634028580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360567155 (or 360567153 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 39.

The spelling of 21634028580 in words is "twenty-one billion, six hundred thirty-four million, twenty-eight thousand, five hundred eighty".