21670612 has 12 divisors (see below), whose sum is σ = 39147136. Its totient is φ = 10485720.

The previous prime is 21670609. The next prime is 21670633. The reversal of 21670612 is 21607612.

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, 87258 + ... + 87505.

Almost surely, 2^21670612 is an apocalyptic number.

It is an amenable number.

21670612 is a deficient number, since it is larger than the sum of its proper divisors (17476524).

21670612 is a wasteful number, since it uses less digits than its factorization.

21670612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174798 (or 174796 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 21670612 is about 4655.1704587480. The cubic root of 21670612 is about 278.7984738775.

The spelling of 21670612 in words is "twenty-one million, six hundred seventy thousand, six hundred twelve".