222132221 has 4 divisors (see below), whose sum is σ = 222557472. Its totient is φ = 221706972.

The previous prime is 222132203. The next prime is 222132241. The reversal of 222132221 is 122231222.

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: 122231222 = 2 ⋅61115611.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-222132221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 222132221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222132241) 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, 211841 + ... + 212886.

It is an arithmetic number, because the mean of its divisors is an integer number (55639368).

Almost surely, 2^222132221 is an apocalyptic number.

It is an amenable number.

222132221 is a deficient number, since it is larger than the sum of its proper divisors (425251).

222132221 is an equidigital number, since it uses as much as digits as its factorization.

222132221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425250.

The product of its digits is 192, while the sum is 17.

The square root of 222132221 is about 14904.1008115216. The cubic root of 222132221 is about 605.6250816984.

Adding to 222132221 its reverse (122231222), we get a palindrome (344363443).

Subtracting from 222132221 its reverse (122231222), we obtain a palindrome (99900999).

The spelling of 222132221 in words is "two hundred twenty-two million, one hundred thirty-two thousand, two hundred twenty-one".