21981832732 has 6 divisors (see below), whose sum is σ = 38468207288. Its totient is φ = 10990916364.

The previous prime is 21981832669. The next prime is 21981832753. The reversal of 21981832732 is 23723818912.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2747729088 + ... + 2747729095.

Almost surely, 2^21981832732 is an apocalyptic number.

It is an amenable number.

21981832732 is a deficient number, since it is larger than the sum of its proper divisors (16486374556).

21981832732 is a wasteful number, since it uses less digits than its factorization.

21981832732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5495458187 (or 5495458185 counting only the distinct ones).

The product of its digits is 290304, while the sum is 46.

The spelling of 21981832732 in words is "twenty-one billion, nine hundred eighty-one million, eight hundred thirty-two thousand, seven hundred thirty-two".