21632396 has 12 divisors (see below), whose sum is σ = 38067120. Its totient is φ = 10756080.

The previous prime is 21632339. The next prime is 21632399. The reversal of 21632396 is 69323612.

It is not an unprimeable number, because it can be changed into a prime (21632399) 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, 14216 + ... + 15663.

It is an arithmetic number, because the mean of its divisors is an integer number (3172260).

Almost surely, 2^21632396 is an apocalyptic number.

It is an amenable number.

21632396 is a deficient number, since it is larger than the sum of its proper divisors (16434724).

21632396 is a wasteful number, since it uses less digits than its factorization.

21632396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30064 (or 30062 counting only the distinct ones).

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

The square root of 21632396 is about 4651.0639642989. The cubic root of 21632396 is about 278.6344909420.

The spelling of 21632396 in words is "twenty-one million, six hundred thirty-two thousand, three hundred ninety-six".