73698997321 has 2 divisors, whose sum is σ = 73698997322. Its totient is φ = 73698997320.

The previous prime is 73698997319. The next prime is 73698997327. The reversal of 73698997321 is 12379989637.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37822470400 + 35876526921 = 194480^2 + 189411^2 .

It is a cyclic number.

It is not a de Polignac number, because 73698997321 - 2¹ = 73698997319 is a prime.

It is a super-2 number, since 2×73698997321² (a number of 23 digits) contains 22 as substring.

Together with 73698997319, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (73698997327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36849498660 + 36849498661.

It is an arithmetic number, because the mean of its divisors is an integer number (36849498661).

Almost surely, 2^73698997321 is an apocalyptic number.

It is an amenable number.

73698997321 is a deficient number, since it is larger than the sum of its proper divisors (1).

73698997321 is an equidigital number, since it uses as much as digits as its factorization.

73698997321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30862944, while the sum is 64.

The spelling of 73698997321 in words is "seventy-three billion, six hundred ninety-eight million, nine hundred ninety-seven thousand, three hundred twenty-one".