21562045369 has 2 divisors, whose sum is σ = 21562045370. Its totient is φ = 21562045368.

The previous prime is 21562045339. The next prime is 21562045411. The reversal of 21562045369 is 96354026512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20438991225 + 1123054144 = 142965^2 + 33512^2 .

It is a cyclic number.

It is not a de Polignac number, because 21562045369 - 2⁹ = 21562044857 is a prime.

It is a super-2 number, since 2×21562045369² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21562045339) 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 as a sum of consecutive naturals, namely, 10781022684 + 10781022685.

It is an arithmetic number, because the mean of its divisors is an integer number (10781022685).

Almost surely, 2^21562045369 is an apocalyptic number.

It is an amenable number.

21562045369 is a deficient number, since it is larger than the sum of its proper divisors (1).

21562045369 is an equidigital number, since it uses as much as digits as its factorization.

21562045369 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 388800, while the sum is 43.

The spelling of 21562045369 in words is "twenty-one billion, five hundred sixty-two million, forty-five thousand, three hundred sixty-nine".