16369312021 has 2 divisors, whose sum is σ = 16369312022. Its totient is φ = 16369312020.

The previous prime is 16369311989. The next prime is 16369312093. The reversal of 16369312021 is 12021396361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12524071921 + 3845240100 = 111911^2 + 62010^2 .

It is a cyclic number.

It is not a de Polignac number, because 16369312021 - 2⁵ = 16369311989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16369310021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8184656010 + 8184656011.

It is an arithmetic number, because the mean of its divisors is an integer number (8184656011).

Almost surely, 2^16369312021 is an apocalyptic number.

It is an amenable number.

16369312021 is a deficient number, since it is larger than the sum of its proper divisors (1).

16369312021 is an equidigital number, since it uses as much as digits as its factorization.

16369312021 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 34.

The spelling of 16369312021 in words is "sixteen billion, three hundred sixty-nine million, three hundred twelve thousand, twenty-one".