21700632 has 16 divisors (see below), whose sum is σ = 54251640. Its totient is φ = 7233536.

The previous prime is 21700631. The next prime is 21700639. The reversal of 21700632 is 23600712.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21700599 and 21700608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21700631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 452073 + ... + 452120.

Almost surely, 2^21700632 is an apocalyptic number.

It is an amenable number.

21700632 is an abundant number, since it is smaller than the sum of its proper divisors (32551008).

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

21700632 is a wasteful number, since it uses less digits than its factorization.

21700632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 904202 (or 904198 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 21700632 is about 4658.3937145759. The cubic root of 21700632 is about 278.9271530372.

The spelling of 21700632 in words is "twenty-one million, seven hundred thousand, six hundred thirty-two".