102202221221 has 2 divisors, whose sum is σ = 102202221222. Its totient is φ = 102202221220.

The previous prime is 102202221211. The next prime is 102202221269. The reversal of 102202221221 is 122122202201.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87654484225 + 14547736996 = 296065^2 + 120614^2 .

It is a cyclic number.

It is not a de Polignac number, because 102202221221 - 2⁶ = 102202221157 is a prime.

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 102202221221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102202221211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51101110610 + 51101110611.

It is an arithmetic number, because the mean of its divisors is an integer number (51101110611).

Almost surely, 2^102202221221 is an apocalyptic number.

It is an amenable number.

102202221221 is a deficient number, since it is larger than the sum of its proper divisors (1).

102202221221 is an equidigital number, since it uses as much as digits as its factorization.

102202221221 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 17.

Adding to 102202221221 its reverse (122122202201), we get a palindrome (224324423422).

The spelling of 102202221221 in words is "one hundred two billion, two hundred two million, two hundred twenty-one thousand, two hundred twenty-one".