73315916021 has 2 divisors, whose sum is σ = 73315916022. Its totient is φ = 73315916020.

The previous prime is 73315915919. The next prime is 73315916057. The reversal of 73315916021 is 12061951337.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73302855025 + 13060996 = 270745^2 + 3614^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-73315916021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73315915021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36657958010 + 36657958011.

It is an arithmetic number, because the mean of its divisors is an integer number (36657958011).

Almost surely, 2^73315916021 is an apocalyptic number.

It is an amenable number.

73315916021 is a deficient number, since it is larger than the sum of its proper divisors (1).

73315916021 is an equidigital number, since it uses as much as digits as its factorization.

73315916021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34020, while the sum is 38.

The spelling of 73315916021 in words is "seventy-three billion, three hundred fifteen million, nine hundred sixteen thousand, twenty-one".