72225321 has 16 divisors (see below), whose sum is σ = 111089664. Its totient is φ = 40884624.

The previous prime is 72225311. The next prime is 72225343. The reversal of 72225321 is 12352227.

It is a happy number.

It is not a de Polignac number, because 72225321 - 2¹³ = 72217129 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 72225291 and 72225300.

It is not an unprimeable number, because it can be changed into a prime (72225311) 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, 13825 + ... + 18318.

It is an arithmetic number, because the mean of its divisors is an integer number (6943104).

Almost surely, 2^72225321 is an apocalyptic number.

It is an amenable number.

72225321 is a deficient number, since it is larger than the sum of its proper divisors (38864343).

72225321 is a wasteful number, since it uses less digits than its factorization.

72225321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32260.

The product of its digits is 1680, while the sum is 24.

The square root of 72225321 is about 8498.5481701288. The cubic root of 72225321 is about 416.4502817434.

Adding to 72225321 its reverse (12352227), we get a palindrome (84577548).

It can be divided in two parts, 72225 and 321, that multiplied together give a square (23184225 = 4815²).

The spelling of 72225321 in words is "seventy-two million, two hundred twenty-five thousand, three hundred twenty-one".