21460666736 has 40 divisors (see below), whose sum is σ = 42609085344. Its totient is φ = 10464957440.

The previous prime is 21460666723. The next prime is 21460666751. The reversal of 21460666736 is 63766606412.

It is a congruent number.

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, 3708101 + ... + 3713883.

Almost surely, 2^21460666736 is an apocalyptic number.

It is an amenable number.

21460666736 is a deficient number, since it is larger than the sum of its proper divisors (21148418608).

21460666736 is a wasteful number, since it uses less digits than its factorization.

21460666736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11489 (or 11483 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 47.

The spelling of 21460666736 in words is "twenty-one billion, four hundred sixty million, six hundred sixty-six thousand, seven hundred thirty-six".