21958739372 has 6 divisors (see below), whose sum is σ = 38427793908. Its totient is φ = 10979369684.

The previous prime is 21958739359. The next prime is 21958739399. The reversal of 21958739372 is 27393785912.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2744842418 + ... + 2744842425.

It is an arithmetic number, because the mean of its divisors is an integer number (6404632318).

Almost surely, 2^21958739372 is an apocalyptic number.

It is an amenable number.

21958739372 is a deficient number, since it is larger than the sum of its proper divisors (16469054536).

21958739372 is a wasteful number, since it uses less digits than its factorization.

21958739372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5489684847 (or 5489684845 counting only the distinct ones).

The product of its digits is 5715360, while the sum is 56.

The spelling of 21958739372 in words is "twenty-one billion, nine hundred fifty-eight million, seven hundred thirty-nine thousand, three hundred seventy-two".