21331322069 has 2 divisors, whose sum is σ = 21331322070. Its totient is φ = 21331322068.

The previous prime is 21331322017. The next prime is 21331322083. The reversal of 21331322069 is 96022313312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13332166225 + 7999155844 = 115465^2 + 89438^2 .

It is a cyclic number.

It is not a de Polignac number, because 21331322069 - 2⁸ = 21331321813 is a prime.

It is a super-2 number, since 2×21331322069² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21331322269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10665661034 + 10665661035.

It is an arithmetic number, because the mean of its divisors is an integer number (10665661035).

Almost surely, 2^21331322069 is an apocalyptic number.

It is an amenable number.

21331322069 is a deficient number, since it is larger than the sum of its proper divisors (1).

21331322069 is an equidigital number, since it uses as much as digits as its factorization.

21331322069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 32.

The spelling of 21331322069 in words is "twenty-one billion, three hundred thirty-one million, three hundred twenty-two thousand, sixty-nine".