21294139312 has 20 divisors (see below), whose sum is σ = 43051195440. Its totient is φ = 10184153408.

The previous prime is 21294139303. The next prime is 21294139337. The reversal of 21294139312 is 21393149212.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28931887 + ... + 28932622.

It is an arithmetic number, because the mean of its divisors is an integer number (2152559772).

Almost surely, 2^21294139312 is an apocalyptic number.

It is an amenable number.

21294139312 is an abundant number, since it is smaller than the sum of its proper divisors (21757056128).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21294139312 is a wasteful number, since it uses less digits than its factorization.

21294139312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57864540 (or 57864534 counting only the distinct ones).

The product of its digits is 23328, while the sum is 37.

The spelling of 21294139312 in words is "twenty-one billion, two hundred ninety-four million, one hundred thirty-nine thousand, three hundred twelve".