21396632 has 8 divisors (see below), whose sum is σ = 40118700. Its totient is φ = 10698312.

The previous prime is 21396611. The next prime is 21396637. The reversal of 21396632 is 23669312.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21396637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1337282 + ... + 1337297.

Almost surely, 2^21396632 is an apocalyptic number.

It is an amenable number.

21396632 is a deficient number, since it is larger than the sum of its proper divisors (18722068).

21396632 is a wasteful number, since it uses less digits than its factorization.

21396632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2674585 (or 2674581 counting only the distinct ones).

The product of its digits is 11664, while the sum is 32.

The square root of 21396632 is about 4625.6493598197. The cubic root of 21396632 is about 277.6185441634.

The spelling of 21396632 in words is "twenty-one million, three hundred ninety-six thousand, six hundred thirty-two".