21522013969 has 2 divisors, whose sum is σ = 21522013970. Its totient is φ = 21522013968.

The previous prime is 21522013939. The next prime is 21522013999. The reversal of 21522013969 is 96931022512.

It is a balanced prime because it is at equal distance from previous prime (21522013939) and next prime (21522013999).

It can be written as a sum of positive squares in only one way, i.e., 13406166225 + 8115847744 = 115785^2 + 90088^2 .

It is a cyclic number.

It is not a de Polignac number, because 21522013969 - 2²³ = 21513625361 is a prime.

It is a super-2 number, since 2×21522013969² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21522013939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10761006984 + 10761006985.

It is an arithmetic number, because the mean of its divisors is an integer number (10761006985).

Almost surely, 2^21522013969 is an apocalyptic number.

It is an amenable number.

21522013969 is a deficient number, since it is larger than the sum of its proper divisors (1).

21522013969 is an equidigital number, since it uses as much as digits as its factorization.

21522013969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 58320, while the sum is 40.

The spelling of 21522013969 in words is "twenty-one billion, five hundred twenty-two million, thirteen thousand, nine hundred sixty-nine".