21837723980 has 24 divisors (see below), whose sum is σ = 47853100512. Its totient is φ = 8355302912.

The previous prime is 21837723913. The next prime is 21837724031. The reversal of 21837723980 is 8932773812.

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, 23736197 + ... + 23737116.

It is an arithmetic number, because the mean of its divisors is an integer number (1993879188).

Almost surely, 2^21837723980 is an apocalyptic number.

21837723980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21837723980 is an abundant number, since it is smaller than the sum of its proper divisors (26015376532).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21837723980 is a wasteful number, since it uses less digits than its factorization.

21837723980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47473345 (or 47473343 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 50.

The spelling of 21837723980 in words is "twenty-one billion, eight hundred thirty-seven million, seven hundred twenty-three thousand, nine hundred eighty".