222120111221 has 2 divisors, whose sum is σ = 222120111222. Its totient is φ = 222120111220.

The previous prime is 222120111209. The next prime is 222120111229. The reversal of 222120111221 is 122111021222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 221545310596 + 574800625 = 470686^2 + 23975^2 .

It is a cyclic number.

It is not a de Polignac number, because 222120111221 - 2²⁶ = 222053002357 is a prime.

It is a super-2 number, since 2×222120111221² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

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 222120111221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222120111229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111060055610 + 111060055611.

It is an arithmetic number, because the mean of its divisors is an integer number (111060055611).

Almost surely, 2^222120111221 is an apocalyptic number.

It is an amenable number.

222120111221 is a deficient number, since it is larger than the sum of its proper divisors (1).

222120111221 is an equidigital number, since it uses as much as digits as its factorization.

222120111221 is an evil number, because the sum of its binary digits is even.

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

Adding to 222120111221 its reverse (122111021222), we get a palindrome (344231132443).

The spelling of 222120111221 in words is "two hundred twenty-two billion, one hundred twenty million, one hundred eleven thousand, two hundred twenty-one".