72216060721 has 32 divisors (see below), whose sum is σ = 86924275200. Its totient is φ = 58658417664.

The previous prime is 72216060677. The next prime is 72216060737. The reversal of 72216060721 is 12706061227.

It is not a de Polignac number, because 72216060721 - 2²³ = 72207672113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72216060781) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8156505 + ... + 8165353.

It is an arithmetic number, because the mean of its divisors is an integer number (2716383600).

Almost surely, 2^72216060721 is an apocalyptic number.

It is an amenable number.

72216060721 is a deficient number, since it is larger than the sum of its proper divisors (14708214479).

72216060721 is a wasteful number, since it uses less digits than its factorization.

72216060721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9345.

The product of its (nonzero) digits is 14112, while the sum is 34.

The spelling of 72216060721 in words is "seventy-two billion, two hundred sixteen million, sixty thousand, seven hundred twenty-one".