21630632168 has 32 divisors (see below), whose sum is σ = 42021504000. Its totient is φ = 10427494080.

The previous prime is 21630632167. The next prime is 21630632173. The reversal of 21630632168 is 86123603612.

It is not an unprimeable number, because it can be changed into a prime (21630632167) 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, 95408 + ... + 228831.

It is an arithmetic number, because the mean of its divisors is an integer number (1313172000).

Almost surely, 2^21630632168 is an apocalyptic number.

It is an amenable number.

21630632168 is a deficient number, since it is larger than the sum of its proper divisors (20390871832).

21630632168 is a wasteful number, since it uses less digits than its factorization.

21630632168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324545 (or 324541 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 38.

The spelling of 21630632168 in words is "twenty-one billion, six hundred thirty million, six hundred thirty-two thousand, one hundred sixty-eight".