21657475612 has 24 divisors (see below), whose sum is σ = 38011417920. Its totient is φ = 10797113280.

The previous prime is 21657475597. The next prime is 21657475613.

21657475612 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21657475613) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2400013 + ... + 2409019.

It is an arithmetic number, because the mean of its divisors is an integer number (1583809080).

Almost surely, 2^21657475612 is an apocalyptic number.

It is an amenable number.

21657475612 is a deficient number, since it is larger than the sum of its proper divisors (16353942308).

21657475612 is a wasteful number, since it uses less digits than its factorization.

21657475612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10701 (or 10699 counting only the distinct ones).

The product of its digits is 705600, while the sum is 46.

The spelling of 21657475612 in words is "twenty-one billion, six hundred fifty-seven million, four hundred seventy-five thousand, six hundred twelve".