72213317434531 has 12 divisors (see below), whose sum is σ = 89366269421712. Its totient is φ = 57135811595616.

The previous prime is 72213317434523. The next prime is 72213317434541. The reversal of 72213317434531 is 13543471331227.

It is not a de Polignac number, because 72213317434531 - 2³ = 72213317434523 is a prime.

It is a super-2 number, since 2×72213317434531² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72213317434541) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30521265696 + ... + 30521268061.

It is an arithmetic number, because the mean of its divisors is an integer number (7447189118476).

Almost surely, 2^{72213317434531} is an apocalyptic number.

72213317434531 is a deficient number, since it is larger than the sum of its proper divisors (17152951987181).

72213317434531 is a wasteful number, since it uses less digits than its factorization.

72213317434531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61042533790 (or 61042533777 counting only the distinct ones).

The product of its digits is 1270080, while the sum is 46.

Adding to 72213317434531 its reverse (13543471331227), we get a palindrome (85756788765758).

The spelling of 72213317434531 in words is "seventy-two trillion, two hundred thirteen billion, three hundred seventeen million, four hundred thirty-four thousand, five hundred thirty-one".