21265424608 has 24 divisors (see below), whose sum is σ = 42041492640. Its totient is φ = 10588220160.

The previous prime is 21265424603. The next prime is 21265424611. The reversal of 21265424608 is 80642456212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21265424603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1382613 + ... + 1397908.

It is an arithmetic number, because the mean of its divisors is an integer number (1751728860).

Almost surely, 2^21265424608 is an apocalyptic number.

It is an amenable number.

21265424608 is a deficient number, since it is larger than the sum of its proper divisors (20776068032).

21265424608 is a wasteful number, since it uses less digits than its factorization.

21265424608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2780770 (or 2780762 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 40.

The spelling of 21265424608 in words is "twenty-one billion, two hundred sixty-five million, four hundred twenty-four thousand, six hundred eight".