72211074570721 has 4 divisors (see below), whose sum is σ = 72392966446612. Its totient is φ = 72029182694832.

The previous prime is 72211074570667. The next prime is 72211074570731. The reversal of 72211074570721 is 12707547011227.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 29614057934400 + 42597016636321 = 5441880^2 + 6526639^2 .

It is a cyclic number.

It is not a de Polignac number, because 72211074570721 - 2⁹ = 72211074570209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72211074570731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90945937350 + ... + 90945938143.

It is an arithmetic number, because the mean of its divisors is an integer number (18098241611653).

Almost surely, 2^{72211074570721} is an apocalyptic number.

It is an amenable number.

72211074570721 is a deficient number, since it is larger than the sum of its proper divisors (181891875891).

72211074570721 is a wasteful number, since it uses less digits than its factorization.

72211074570721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181891875890.

The product of its (nonzero) digits is 384160, while the sum is 46.

The spelling of 72211074570721 in words is "seventy-two trillion, two hundred eleven billion, seventy-four million, five hundred seventy thousand, seven hundred twenty-one".