222101231221 has 2 divisors, whose sum is σ = 222101231222. Its totient is φ = 222101231220.

The previous prime is 222101231197. The next prime is 222101231239. The reversal of 222101231221 is 122132101222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 216085522500 + 6015708721 = 464850^2 + 77561^2 .

It is a cyclic number.

It is not a de Polignac number, because 222101231221 - 2⁵ = 222101231189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222101237221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111050615610 + 111050615611.

It is an arithmetic number, because the mean of its divisors is an integer number (111050615611).

Almost surely, 2^222101231221 is an apocalyptic number.

It is an amenable number.

222101231221 is a deficient number, since it is larger than the sum of its proper divisors (1).

222101231221 is an equidigital number, since it uses as much as digits as its factorization.

222101231221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 222101231221 its reverse (122132101222), we get a palindrome (344233332443).

The spelling of 222101231221 in words is "two hundred twenty-two billion, one hundred one million, two hundred thirty-one thousand, two hundred twenty-one".