21300561575 has 6 divisors (see below), whose sum is σ = 26412696384. Its totient is φ = 17040449240.

The previous prime is 21300561563. The next prime is 21300561577. The reversal of 21300561575 is 57516500312.

It is not a de Polignac number, because 21300561575 - 2²⁰ = 21299512999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21300561577) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 426011207 + ... + 426011256.

It is an arithmetic number, because the mean of its divisors is an integer number (4402116064).

Almost surely, 2^21300561575 is an apocalyptic number.

21300561575 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21300561575 is a deficient number, since it is larger than the sum of its proper divisors (5112134809).

21300561575 is an equidigital number, since it uses as much as digits as its factorization.

21300561575 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 852022473 (or 852022468 counting only the distinct ones).

The product of its (nonzero) digits is 31500, while the sum is 35.

The spelling of 21300561575 in words is "twenty-one billion, three hundred million, five hundred sixty-one thousand, five hundred seventy-five".