21576432630 has 32 divisors (see below), whose sum is σ = 51788229984. Its totient is φ = 5753182976.

The previous prime is 21576432613. The next prime is 21576432643. The reversal of 21576432630 is 3623467512.

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, 380824 + ... + 433796.

It is an arithmetic number, because the mean of its divisors is an integer number (1618382187).

Almost surely, 2^21576432630 is an apocalyptic number.

21576432630 is an abundant number, since it is smaller than the sum of its proper divisors (30211797354).

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

21576432630 is a wasteful number, since it uses less digits than its factorization.

21576432630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66560.

The product of its (nonzero) digits is 181440, while the sum is 39.

The spelling of 21576432630 in words is "twenty-one billion, five hundred seventy-six million, four hundred thirty-two thousand, six hundred thirty".