21132066464 has 48 divisors (see below), whose sum is σ = 41785065000. Its totient is φ = 10520100864.

The previous prime is 21132066457. The next prime is 21132066493. The reversal of 21132066464 is 46466023112.

It can be written as a sum of positive squares in 4 ways, for example, as 19650432400 + 1481634064 = 140180^2 + 38492^2 .

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, 8289062 + ... + 8291610.

Almost surely, 2^21132066464 is an apocalyptic number.

It is an amenable number.

21132066464 is a deficient number, since it is larger than the sum of its proper divisors (20652998536).

21132066464 is a wasteful number, since it uses less digits than its factorization.

21132066464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3585 (or 3577 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 35.

Adding to 21132066464 its reverse (46466023112), we get a palindrome (67598089576).

The spelling of 21132066464 in words is "twenty-one billion, one hundred thirty-two million, sixty-six thousand, four hundred sixty-four".