21331302169 has 2 divisors, whose sum is σ = 21331302170. Its totient is φ = 21331302168.

The previous prime is 21331302119. The next prime is 21331302173. The reversal of 21331302169 is 96120313312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18968175625 + 2363126544 = 137725^2 + 48612^2 .

It is a cyclic number.

It is not a de Polignac number, because 21331302169 - 2²¹ = 21329205017 is a prime.

It is a super-2 number, since 2×21331302169² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21331302169.

It is not a weakly prime, because it can be changed into another prime (21331302119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10665651084 + 10665651085.

It is an arithmetic number, because the mean of its divisors is an integer number (10665651085).

Almost surely, 2^21331302169 is an apocalyptic number.

It is an amenable number.

21331302169 is a deficient number, since it is larger than the sum of its proper divisors (1).

21331302169 is an equidigital number, since it uses as much as digits as its factorization.

21331302169 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 31.

The spelling of 21331302169 in words is "twenty-one billion, three hundred thirty-one million, three hundred two thousand, one hundred sixty-nine".