721934471931 has 16 divisors (see below), whose sum is σ = 1019221183008. Its totient is φ = 452969792000.

The previous prime is 721934471887. The next prime is 721934471933. The reversal of 721934471931 is 139174439127.

It is a cyclic number.

It is not a de Polignac number, because 721934471931 - 2²⁶ = 721867363067 is a prime.

It is a super-2 number, since 2×721934471931² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (721934471933) 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, 3478381 + ... + 3680081.

It is an arithmetic number, because the mean of its divisors is an integer number (63701323938).

Almost surely, 2^721934471931 is an apocalyptic number.

721934471931 is a deficient number, since it is larger than the sum of its proper divisors (297286711077).

721934471931 is a wasteful number, since it uses less digits than its factorization.

721934471931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271902.

The product of its digits is 1143072, while the sum is 51.

The spelling of 721934471931 in words is "seven hundred twenty-one billion, nine hundred thirty-four million, four hundred seventy-one thousand, nine hundred thirty-one".