222110211221 has 4 divisors (see below), whose sum is σ = 222111346944. Its totient is φ = 222109075500.

The previous prime is 222110211181. The next prime is 222110211241. The reversal of 222110211221 is 122112011222.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 222110211221 - 2²⁶ = 222043102357 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 222110211221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222110211241) 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, 191255 + ... + 693396.

It is an arithmetic number, because the mean of its divisors is an integer number (55527836736).

Almost surely, 2^222110211221 is an apocalyptic number.

It is an amenable number.

222110211221 is a deficient number, since it is larger than the sum of its proper divisors (1135723).

222110211221 is an equidigital number, since it uses as much as digits as its factorization.

222110211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1135722.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 222110211221 its reverse (122112011222), we get a palindrome (344222222443).

The spelling of 222110211221 in words is "two hundred twenty-two billion, one hundred ten million, two hundred eleven thousand, two hundred twenty-one".