21633286855769 has 2 divisors, whose sum is σ = 21633286855770. Its totient is φ = 21633286855768.

The previous prime is 21633286855753. The next prime is 21633286855777. The reversal of 21633286855769 is 96755868233612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18569316679369 + 3063970176400 = 4309213^2 + 1750420^2 .

It is a cyclic number.

It is not a de Polignac number, because 21633286855769 - 2⁴ = 21633286855753 is a prime.

It is a super-2 number, since 2×21633286855769² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21633286855669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10816643427884 + 10816643427885.

It is an arithmetic number, because the mean of its divisors is an integer number (10816643427885).

Almost surely, 2^{21633286855769} is an apocalyptic number.

It is an amenable number.

21633286855769 is a deficient number, since it is larger than the sum of its proper divisors (1).

21633286855769 is an equidigital number, since it uses as much as digits as its factorization.

21633286855769 is an evil number, because the sum of its binary digits is even.

The product of its digits is 783820800, while the sum is 71.

The spelling of 21633286855769 in words is "twenty-one trillion, six hundred thirty-three billion, two hundred eighty-six million, eight hundred fifty-five thousand, seven hundred sixty-nine".