21137612 has 12 divisors (see below), whose sum is σ = 37054920. Its totient is φ = 10550496.

The previous prime is 21137609. The next prime is 21137657. The reversal of 21137612 is 21673112.

It is a plaindrome in base 7.

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, 1793 + ... + 6744.

It is an arithmetic number, because the mean of its divisors is an integer number (3087910).

Almost surely, 2^21137612 is an apocalyptic number.

It is an amenable number.

21137612 is a deficient number, since it is larger than the sum of its proper divisors (15917308).

21137612 is a wasteful number, since it uses less digits than its factorization.

21137612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9160 (or 9158 counting only the distinct ones).

The product of its digits is 504, while the sum is 23.

The square root of 21137612 is about 4597.5658777227. The cubic root of 21137612 is about 276.4937426848.

The spelling of 21137612 in words is "twenty-one million, one hundred thirty-seven thousand, six hundred twelve".