21630631632 has 40 divisors (see below), whose sum is σ = 59166141696. Its totient is φ = 6786080256.

The previous prime is 21630631619. The next prime is 21630631639. The reversal of 21630631632 is 23613603612.

It is a junction number, because it is equal to n+sod(n) for n = 21630631593 and 21630631602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21630631639) 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, 13253248 + ... + 13254879.

Almost surely, 2^21630631632 is an apocalyptic number.

It is an amenable number.

21630631632 is an abundant number, since it is smaller than the sum of its proper divisors (37535510064).

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

21630631632 is a wasteful number, since it uses less digits than its factorization.

21630631632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26508155 (or 26508149 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 33.

The spelling of 21630631632 in words is "twenty-one billion, six hundred thirty million, six hundred thirty-one thousand, six hundred thirty-two".