391104723321 has 16 divisors (see below), whose sum is σ = 623984744320. Its totient is φ = 240679829520.

The previous prime is 391104723319. The next prime is 391104723341. The reversal of 391104723321 is 123327401193.

391104723321 is a `hidden beast` number, since 391 + 10 + 4 + 7 + 233 + 21 = 666.

It is not a de Polignac number, because 391104723321 - 2¹ = 391104723319 is a prime.

It is a super-2 number, since 2×391104723321² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (391104723341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 557128885 + ... + 557129586.

It is an arithmetic number, because the mean of its divisors is an integer number (38999046520).

Almost surely, 2^391104723321 is an apocalyptic number.

It is an amenable number.

391104723321 is a deficient number, since it is larger than the sum of its proper divisors (232880020999).

391104723321 is a wasteful number, since it uses less digits than its factorization.

391104723321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1114258493 (or 1114258487 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The spelling of 391104723321 in words is "three hundred ninety-one billion, one hundred four million, seven hundred twenty-three thousand, three hundred twenty-one".