72016722221 has 8 divisors (see below), whose sum is σ = 74506384920. Its totient is φ = 69527481408.

The previous prime is 72016722161. The next prime is 72016722247. The reversal of 72016722221 is 12222761027.

It can be written as a sum of positive squares in 4 ways, for example, as 17267274025 + 54749448196 = 131405^2 + 233986^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72016722221 - 2¹⁸ = 72016460077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72016722121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 263795 + ... + 462191.

It is an arithmetic number, because the mean of its divisors is an integer number (9313298115).

Almost surely, 2^72016722221 is an apocalyptic number.

It is an amenable number.

72016722221 is a deficient number, since it is larger than the sum of its proper divisors (2489662699).

72016722221 is a wasteful number, since it uses less digits than its factorization.

72016722221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210943.

The product of its (nonzero) digits is 9408, while the sum is 32.

The spelling of 72016722221 in words is "seventy-two billion, sixteen million, seven hundred twenty-two thousand, two hundred twenty-one".