21452466664 has 16 divisors (see below), whose sum is σ = 40227135300. Its totient is φ = 10725230592.

The previous prime is 21452466631. The next prime is 21452466709. The reversal of 21452466664 is 46666425412.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21245394564 + 207072100 = 145758^2 + 14390^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30169 + ... + 209320.

Almost surely, 2^21452466664 is an apocalyptic number.

It is an amenable number.

21452466664 is a deficient number, since it is larger than the sum of its proper divisors (18774668636).

21452466664 is a wasteful number, since it uses less digits than its factorization.

21452466664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250692 (or 250688 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 46.

The spelling of 21452466664 in words is "twenty-one billion, four hundred fifty-two million, four hundred sixty-six thousand, six hundred sixty-four".