21366024664 has 32 divisors (see below), whose sum is σ = 40252489200. Its totient is φ = 10632084480.

The previous prime is 21366024661. The next prime is 21366024689. The reversal of 21366024664 is 46642066312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21366024661) 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, 4970164 + ... + 4974460.

Almost surely, 2^21366024664 is an apocalyptic number.

It is an amenable number.

21366024664 is a deficient number, since it is larger than the sum of its proper divisors (18886464536).

21366024664 is a wasteful number, since it uses less digits than its factorization.

21366024664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7123 (or 7119 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 40.

The spelling of 21366024664 in words is "twenty-one billion, three hundred sixty-six million, twenty-four thousand, six hundred sixty-four".