221325213 has 16 divisors (see below), whose sum is σ = 306176000. Its totient is φ = 142061040.

The previous prime is 221325199. The next prime is 221325217. The reversal of 221325213 is 312523122.

It is not a de Polignac number, because 221325213 - 2⁴ = 221325197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 221325213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221325217) 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, 12528 + ... + 24486.

It is an arithmetic number, because the mean of its divisors is an integer number (19136000).

Almost surely, 2^221325213 is an apocalyptic number.

It is an amenable number.

221325213 is a deficient number, since it is larger than the sum of its proper divisors (84850787).

221325213 is a wasteful number, since it uses less digits than its factorization.

221325213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12192.

The product of its digits is 720, while the sum is 21.

The square root of 221325213 is about 14877.0028231496. The cubic root of 221325213 is about 604.8907782706.

Adding to 221325213 its reverse (312523122), we get a palindrome (533848335).

The spelling of 221325213 in words is "two hundred twenty-one million, three hundred twenty-five thousand, two hundred thirteen".