21906300569 has 2 divisors, whose sum is σ = 21906300570. Its totient is φ = 21906300568.

The previous prime is 21906300551. The next prime is 21906300607. The reversal of 21906300569 is 96500360912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20523427600 + 1382872969 = 143260^2 + 37187^2 .

It is a cyclic number.

It is not a de Polignac number, because 21906300569 - 2²⁸ = 21637865113 is a prime.

It is a super-2 number, since 2×21906300569² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (21906300539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10953150284 + 10953150285.

It is an arithmetic number, because the mean of its divisors is an integer number (10953150285).

Almost surely, 2^21906300569 is an apocalyptic number.

It is an amenable number.

21906300569 is a deficient number, since it is larger than the sum of its proper divisors (1).

21906300569 is an equidigital number, since it uses as much as digits as its factorization.

21906300569 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 87480, while the sum is 41.

The spelling of 21906300569 in words is "twenty-one billion, nine hundred six million, three hundred thousand, five hundred sixty-nine".