21139312 has 20 divisors (see below), whose sum is σ = 41029120. Its totient is φ = 10551168.

The previous prime is 21139301. The next prime is 21139337. The reversal of 21139312 is 21393112.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15889 + ... + 17167.

It is an arithmetic number, because the mean of its divisors is an integer number (2051456).

Almost surely, 2^21139312 is an apocalyptic number.

It is an amenable number.

21139312 is a deficient number, since it is larger than the sum of its proper divisors (19889808).

21139312 is a wasteful number, since it uses less digits than its factorization.

21139312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2320 (or 2314 counting only the distinct ones).

The product of its digits is 324, while the sum is 22.

The square root of 21139312 is about 4597.7507544450. The cubic root of 21139312 is about 276.5011548555.

The spelling of 21139312 in words is "twenty-one million, one hundred thirty-nine thousand, three hundred twelve".