21300561372 has 24 divisors (see below), whose sum is σ = 51862237056. Its totient is φ = 6791483248.

The previous prime is 21300561371. The next prime is 21300561377. The reversal of 21300561372 is 27316500312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21300561371) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38587698 + ... + 38588249.

It is an arithmetic number, because the mean of its divisors is an integer number (2160926544).

Almost surely, 2^21300561372 is an apocalyptic number.

It is an amenable number.

21300561372 is an abundant number, since it is smaller than the sum of its proper divisors (30561675684).

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

21300561372 is a wasteful number, since it uses less digits than its factorization.

21300561372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77175977 (or 77175975 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 30.

The spelling of 21300561372 in words is "twenty-one billion, three hundred million, five hundred sixty-one thousand, three hundred seventy-two".