21373612 has 12 divisors (see below), whose sum is σ = 40281136. Its totient is φ = 9864720.

The previous prime is 21373591. The next prime is 21373657. The reversal of 21373612 is 21637312.

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, 205464 + ... + 205567.

Almost surely, 2^21373612 is an apocalyptic number.

It is an amenable number.

21373612 is a deficient number, since it is larger than the sum of its proper divisors (18907524).

21373612 is a wasteful number, since it uses less digits than its factorization.

21373612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411048 (or 411046 counting only the distinct ones).

The product of its digits is 1512, while the sum is 25.

The square root of 21373612 is about 4623.1603909014. The cubic root of 21373612 is about 277.5189479257.

The spelling of 21373612 in words is "twenty-one million, three hundred seventy-three thousand, six hundred twelve".