21300999972 has 96 divisors (see below), whose sum is σ = 57181200384. Its totient is φ = 6045580800.

The previous prime is 21300999971. The next prime is 21301000001. The reversal of 21300999972 is 27999900312.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21300999971) by changing a digit.

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 in 31 ways as a sum of consecutive naturals, for example, 9938733 + ... + 9940875.

It is an arithmetic number, because the mean of its divisors is an integer number (595637504).

Almost surely, 2^21300999972 is an apocalyptic number.

It is an amenable number.

21300999972 is an abundant number, since it is smaller than the sum of its proper divisors (35880200412).

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

21300999972 is a wasteful number, since it uses less digits than its factorization.

21300999972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2889 (or 2887 counting only the distinct ones).

The product of its (nonzero) digits is 551124, while the sum is 51.

The spelling of 21300999972 in words is "twenty-one billion, three hundred million, nine hundred ninety-nine thousand, nine hundred seventy-two".