222201221110021 has 2 divisors, whose sum is σ = 222201221110022. Its totient is φ = 222201221110020.

The previous prime is 222201221110019. The next prime is 222201221110027. The reversal of 222201221110021 is 120011122102222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 195474792312900 + 26726428797121 = 13981230^2 + 5169761^2 .

It is a cyclic number.

It is not a de Polignac number, because 222201221110021 - 2¹ = 222201221110019 is a prime.

Together with 222201221110019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222201221110027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111100610555010 + 111100610555011.

It is an arithmetic number, because the mean of its divisors is an integer number (111100610555011).

Almost surely, 2^{222201221110021} is an apocalyptic number.

It is an amenable number.

222201221110021 is a deficient number, since it is larger than the sum of its proper divisors (1).

222201221110021 is an equidigital number, since it uses as much as digits as its factorization.

222201221110021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 222201221110021 its reverse (120011122102222), we get a palindrome (342212343212243).

The spelling of 222201221110021 in words is "two hundred twenty-two trillion, two hundred one billion, two hundred twenty-one million, one hundred ten thousand, twenty-one".