21634502 has 16 divisors (see below), whose sum is σ = 34398000. Its totient is φ = 10176480.

The previous prime is 21634453. The next prime is 21634537. The reversal of 21634502 is 20543612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3752 + ... + 7572.

It is an arithmetic number, because the mean of its divisors is an integer number (2149875).

Almost surely, 2^21634502 is an apocalyptic number.

21634502 is a deficient number, since it is larger than the sum of its proper divisors (12763498).

21634502 is a wasteful number, since it uses less digits than its factorization.

21634502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3991.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 21634502 is about 4651.2903585994. The cubic root of 21634502 is about 278.6435327081.

The spelling of 21634502 in words is "twenty-one million, six hundred thirty-four thousand, five hundred two".