21418612 has 12 divisors (see below), whose sum is σ = 39112416. Its totient is φ = 10243640.

The previous prime is 21418571. The next prime is 21418633. The reversal of 21418612 is 21681412.

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, 116314 + ... + 116497.

It is an arithmetic number, because the mean of its divisors is an integer number (3259368).

Almost surely, 2^21418612 is an apocalyptic number.

It is an amenable number.

21418612 is a deficient number, since it is larger than the sum of its proper divisors (17693804).

21418612 is a wasteful number, since it uses less digits than its factorization.

21418612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232838 (or 232836 counting only the distinct ones).

The product of its digits is 768, while the sum is 25.

The square root of 21418612 is about 4628.0246326051. The cubic root of 21418612 is about 277.7135741868.

The spelling of 21418612 in words is "twenty-one million, four hundred eighteen thousand, six hundred twelve".