21167312612 has 24 divisors (see below), whose sum is σ = 40133925216. Its totient is φ = 9729433728.

The previous prime is 21167312603. The next prime is 21167312623. The reversal of 21167312612 is 21621376112.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3616658 + ... + 3622505.

It is an arithmetic number, because the mean of its divisors is an integer number (1672246884).

Almost surely, 2^21167312612 is an apocalyptic number.

It is an amenable number.

21167312612 is a deficient number, since it is larger than the sum of its proper divisors (18966612604).

21167312612 is a wasteful number, since it uses less digits than its factorization.

21167312612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7239227 (or 7239225 counting only the distinct ones).

The product of its digits is 6048, while the sum is 32.

Adding to 21167312612 its reverse (21621376112), we get a palindrome (42788688724).

The spelling of 21167312612 in words is "twenty-one billion, one hundred sixty-seven million, three hundred twelve thousand, six hundred twelve".