72022521 has 16 divisors (see below), whose sum is σ = 102598400. Its totient is φ = 44806608.

The previous prime is 72022501. The next prime is 72022541. The reversal of 72022521 is 12522027.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (72022501) and next prime (72022541).

It is a de Polignac number, because none of the positive numbers 2^k-72022521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72022501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5611 + ... + 13248.

It is an arithmetic number, because the mean of its divisors is an integer number (6412400).

Almost surely, 2^72022521 is an apocalyptic number.

It is an amenable number.

72022521 is a deficient number, since it is larger than the sum of its proper divisors (30575879).

72022521 is a wasteful number, since it uses less digits than its factorization.

72022521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18948.

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 72022521 is about 8486.6083331329. The cubic root of 72022521 is about 416.0601356144.

Adding to 72022521 its reverse (12522027), we get a palindrome (84544548).

The spelling of 72022521 in words is "seventy-two million, twenty-two thousand, five hundred twenty-one".