72220021117 has 4 divisors (see below), whose sum is σ = 76021074880. Its totient is φ = 68418967356.

The previous prime is 72220021099. The next prime is 72220021123. The reversal of 72220021117 is 71112002227.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 71112002227 = 7 ⋅10158857461.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72220021117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72220021091 and 72220021100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72220021717) 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, 1900526853 + ... + 1900526890.

It is an arithmetic number, because the mean of its divisors is an integer number (19005268720).

Almost surely, 2^72220021117 is an apocalyptic number.

It is an amenable number.

72220021117 is a deficient number, since it is larger than the sum of its proper divisors (3801053763).

72220021117 is a wasteful number, since it uses less digits than its factorization.

72220021117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3801053762.

The product of its (nonzero) digits is 784, while the sum is 25.

The spelling of 72220021117 in words is "seventy-two billion, two hundred twenty million, twenty-one thousand, one hundred seventeen".