21632402 has 16 divisors (see below), whose sum is σ = 35629632. Its totient is φ = 9768720.

The previous prime is 21632399. The next prime is 21632407. The reversal of 21632402 is 20423612.

It is not an unprimeable number, because it can be changed into a prime (21632407) 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, 323 + ... + 6585.

It is an arithmetic number, because the mean of its divisors is an integer number (2226852).

Almost surely, 2^21632402 is an apocalyptic number.

21632402 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21632402 is a deficient number, since it is larger than the sum of its proper divisors (13997230).

21632402 is a wasteful number, since it uses less digits than its factorization.

21632402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6433.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 21632402 is about 4651.0646093126. The cubic root of 21632402 is about 278.6345167029.

The spelling of 21632402 in words is "twenty-one million, six hundred thirty-two thousand, four hundred two".