21881594938 has 24 divisors (see below), whose sum is σ = 38718925344. Its totient is φ = 9245741400.

The previous prime is 21881594899. The next prime is 21881594957. The reversal of 21881594938 is 83949518812.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1565448 + ... + 1579363.

It is an arithmetic number, because the mean of its divisors is an integer number (1613288556).

Almost surely, 2^21881594938 is an apocalyptic number.

21881594938 is a deficient number, since it is larger than the sum of its proper divisors (16837330406).

21881594938 is a wasteful number, since it uses less digits than its factorization.

21881594938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3144898 (or 3144891 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 58.

The spelling of 21881594938 in words is "twenty-one billion, eight hundred eighty-one million, five hundred ninety-four thousand, nine hundred thirty-eight".