21267457864 has 32 divisors (see below), whose sum is σ = 41350176000. Its totient is φ = 10242498112.

The previous prime is 21267457801. The next prime is 21267457873. The reversal of 21267457864 is 46875476212.

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, 12184 + ... + 206599.

It is an arithmetic number, because the mean of its divisors is an integer number (1292193000).

Almost surely, 2^21267457864 is an apocalyptic number.

It is an amenable number.

21267457864 is a deficient number, since it is larger than the sum of its proper divisors (20082718136).

21267457864 is a wasteful number, since it uses less digits than its factorization.

21267457864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219237 (or 219233 counting only the distinct ones).

The product of its digits is 4515840, while the sum is 52.

The spelling of 21267457864 in words is "twenty-one billion, two hundred sixty-seven million, four hundred fifty-seven thousand, eight hundred sixty-four".