71721236323 has 16 divisors (see below), whose sum is σ = 79323753600. Its totient is φ = 64301894080.

The previous prime is 71721236273. The next prime is 71721236359. The reversal of 71721236323 is 32363212717.

It is a cyclic number.

It is not a de Polignac number, because 71721236323 - 2⁹ = 71721235811 is a prime.

It is a super-2 number, since 2×71721236323² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71721236383) 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, 450468 + ... + 588526.

It is an arithmetic number, because the mean of its divisors is an integer number (4957734600).

Almost surely, 2^71721236323 is an apocalyptic number.

71721236323 is a deficient number, since it is larger than the sum of its proper divisors (7602517277).

71721236323 is a wasteful number, since it uses less digits than its factorization.

71721236323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138722.

The product of its digits is 63504, while the sum is 37.

The spelling of 71721236323 in words is "seventy-one billion, seven hundred twenty-one million, two hundred thirty-six thousand, three hundred twenty-three".