21460636 has 12 divisors (see below), whose sum is σ = 38117128. Its totient is φ = 10570032.

The previous prime is 21460603. The next prime is 21460643. The reversal of 21460636 is 63606412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39771 + ... + 40306.

Almost surely, 2^21460636 is an apocalyptic number.

It is an amenable number.

21460636 is a deficient number, since it is larger than the sum of its proper divisors (16656492).

21460636 is a wasteful number, since it uses less digits than its factorization.

21460636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80148 (or 80146 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 21460636 is about 4632.5625737814. The cubic root of 21460636 is about 277.8950831602.

The spelling of 21460636 in words is "twenty-one million, four hundred sixty thousand, six hundred thirty-six".