21112076657569 has 2 divisors, whose sum is σ = 21112076657570. Its totient is φ = 21112076657568.

The previous prime is 21112076657561. The next prime is 21112076657599. The reversal of 21112076657569 is 96575667021112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12623361325969 + 8488715331600 = 3552937^2 + 2913540^2 .

It is a cyclic number.

It is not a de Polignac number, because 21112076657569 - 2³ = 21112076657561 is a prime.

It is a super-2 number, since 2×21112076657569² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21112076657561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556038328784 + 10556038328785.

It is an arithmetic number, because the mean of its divisors is an integer number (10556038328785).

Almost surely, 2^{21112076657569} is an apocalyptic number.

It is an amenable number.

21112076657569 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112076657569 is an equidigital number, since it uses as much as digits as its factorization.

21112076657569 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9525600, while the sum is 58.

The spelling of 21112076657569 in words is "twenty-one trillion, one hundred twelve billion, seventy-six million, six hundred fifty-seven thousand, five hundred sixty-nine".