222221202121 has 2 divisors, whose sum is σ = 222221202122. Its totient is φ = 222221202120.

The previous prime is 222221202109. The next prime is 222221202197. The reversal of 222221202121 is 121202122222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 178473296521 + 43747905600 = 422461^2 + 209160^2 .

It is a cyclic number.

It is not a de Polignac number, because 222221202121 - 2²³ = 222212813513 is a prime.

It is not a weakly prime, because it can be changed into another prime (222221262121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111110601060 + 111110601061.

It is an arithmetic number, because the mean of its divisors is an integer number (111110601061).

Almost surely, 2^222221202121 is an apocalyptic number.

It is an amenable number.

222221202121 is a deficient number, since it is larger than the sum of its proper divisors (1).

222221202121 is an equidigital number, since it uses as much as digits as its factorization.

222221202121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 222221202121 its reverse (121202122222), we get a palindrome (343423324343).

The spelling of 222221202121 in words is "two hundred twenty-two billion, two hundred twenty-one million, two hundred two thousand, one hundred twenty-one".