72221115605220 has 72 divisors (see below), whose sum is σ = 226137514686720. Its totient is φ = 18637707251520.

The previous prime is 72221115605203. The next prime is 72221115605263. The reversal of 72221115605220 is 2250651112227.

72221115605220 is a `hidden beast` number, since 7 + 2 + 2 + 2 + 11 + 15 + 605 + 2 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6471420550 + ... + 6471431709.

Almost surely, 2^{72221115605220} is an apocalyptic number.

It is an amenable number.

72221115605220 is an abundant number, since it is smaller than the sum of its proper divisors (153916399081500).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72221115605220 is a wasteful number, since it uses less digits than its factorization.

72221115605220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12942852305 (or 12942852300 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 36.

Adding to 72221115605220 its reverse (2250651112227), we get a palindrome (74471766717447).

The spelling of 72221115605220 in words is "seventy-two trillion, two hundred twenty-one billion, one hundred fifteen million, six hundred five thousand, two hundred twenty".