21862997864 has 16 divisors (see below), whose sum is σ = 40997124000. Its totient is φ = 10930431472.

The previous prime is 21862997831. The next prime is 21862997963. The reversal of 21862997864 is 46879926812.

It is a junction number, because it is equal to n+sod(n) for n = 21862997797 and 21862997806.

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, 42764 + ... + 213435.

It is an arithmetic number, because the mean of its divisors is an integer number (2562320250).

Almost surely, 2^21862997864 is an apocalyptic number.

It is an amenable number.

21862997864 is a deficient number, since it is larger than the sum of its proper divisors (19134126136).

21862997864 is a wasteful number, since it uses less digits than its factorization.

21862997864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266872 (or 266868 counting only the distinct ones).

The product of its digits is 20901888, while the sum is 62.

The spelling of 21862997864 in words is "twenty-one billion, eight hundred sixty-two million, nine hundred ninety-seven thousand, eight hundred sixty-four".