21232515970 has 16 divisors (see below), whose sum is σ = 39451385088. Its totient is φ = 8219038320.

The previous prime is 21232515911. The next prime is 21232516007. The reversal of 21232515970 is 7951523212.

It is a happy number.

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, 34245684 + ... + 34246303.

It is an arithmetic number, because the mean of its divisors is an integer number (2465711568).

Almost surely, 2^21232515970 is an apocalyptic number.

21232515970 is a deficient number, since it is larger than the sum of its proper divisors (18218869118).

21232515970 is a wasteful number, since it uses less digits than its factorization.

21232515970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68492025.

The product of its (nonzero) digits is 37800, while the sum is 37.

The spelling of 21232515970 in words is "twenty-one billion, two hundred thirty-two million, five hundred fifteen thousand, nine hundred seventy".