21300563057 has 4 divisors (see below), whose sum is σ = 21328119540. Its totient is φ = 21273006576.

The previous prime is 21300563027. The next prime is 21300563069. The reversal of 21300563057 is 75036500312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6054240481 + 15246322576 = 77809^2 + 123476^2 .

It is a cyclic number.

It is not a de Polignac number, because 21300563057 - 2⁶ = 21300562993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21300563027) 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 3 ways as a sum of consecutive naturals, for example, 13777082 + ... + 13778627.

It is an arithmetic number, because the mean of its divisors is an integer number (5332029885).

Almost surely, 2^21300563057 is an apocalyptic number.

It is an amenable number.

21300563057 is a deficient number, since it is larger than the sum of its proper divisors (27556483).

21300563057 is an equidigital number, since it uses as much as digits as its factorization.

21300563057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27556482.

The product of its (nonzero) digits is 18900, while the sum is 32.

The spelling of 21300563057 in words is "twenty-one billion, three hundred million, five hundred sixty-three thousand, fifty-seven".