21300955812 has 36 divisors (see below), whose sum is σ = 53849595436. Its totient is φ = 7099591680.

The previous prime is 21300955807. The next prime is 21300955813. The reversal of 21300955812 is 21855900312.

It can be written as a sum of positive squares in 2 ways, for example, as 12295704996 + 9005250816 = 110886^2 + 94896^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (21300955813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 416508 + ... + 464844.

Almost surely, 2^21300955812 is an apocalyptic number.

It is an amenable number.

21300955812 is an abundant number, since it is smaller than the sum of its proper divisors (32548639624).

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

21300955812 is a wasteful number, since it uses less digits than its factorization.

21300955812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60588 (or 60583 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The spelling of 21300955812 in words is "twenty-one billion, three hundred million, nine hundred fifty-five thousand, eight hundred twelve".