721705027031131 has 16 divisors (see below), whose sum is σ = 849195861776640. Its totient is φ = 604684719522720.

The previous prime is 721705027031101. The next prime is 721705027031159. The reversal of 721705027031131 is 131130720507127.

It is a cyclic number.

It is not a de Polignac number, because 721705027031131 - 2³⁵ = 721670667292763 is a prime.

It is a super-2 number, since 2×721705027031131² (a number of 31 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (721705027031101) 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, 3924393511 + ... + 3924577408.

It is an arithmetic number, because the mean of its divisors is an integer number (53074741361040).

Almost surely, 2^{721705027031131} is an apocalyptic number.

721705027031131 is a deficient number, since it is larger than the sum of its proper divisors (127490834745509).

721705027031131 is a wasteful number, since it uses less digits than its factorization.

721705027031131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7848971586.

The product of its (nonzero) digits is 61740, while the sum is 40.

Adding to 721705027031131 its reverse (131130720507127), we get a palindrome (852835747538258).

The spelling of 721705027031131 in words is "seven hundred twenty-one trillion, seven hundred five billion, twenty-seven million, thirty-one thousand, one hundred thirty-one".