21125766608 has 20 divisors (see below), whose sum is σ = 41012562528. Its totient is φ = 10541879520.

The previous prime is 21125766581. The next prime is 21125766671. The reversal of 21125766608 is 80666752112.

It is a congruent number.

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, 1304438 + ... + 1320533.

Almost surely, 2^21125766608 is an apocalyptic number.

It is an amenable number.

21125766608 is a deficient number, since it is larger than the sum of its proper divisors (19886795920).

21125766608 is a wasteful number, since it uses less digits than its factorization.

21125766608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2625482 (or 2625476 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 44.

The spelling of 21125766608 in words is "twenty-one billion, one hundred twenty-five million, seven hundred sixty-six thousand, six hundred eight".