102222100101221 has 2 divisors, whose sum is σ = 102222100101222. Its totient is φ = 102222100101220.

The previous prime is 102222100101211. The next prime is 102222100101257. The reversal of 102222100101221 is 122101001222201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 96582016588225 + 5640083512996 = 9827615^2 + 2374886^2 .

It is a cyclic number.

It is not a de Polignac number, because 102222100101221 - 2¹⁸ = 102222099839077 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 102222100101221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102222100101211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51111050050610 + 51111050050611.

It is an arithmetic number, because the mean of its divisors is an integer number (51111050050611).

Almost surely, 2^{102222100101221} is an apocalyptic number.

It is an amenable number.

102222100101221 is a deficient number, since it is larger than the sum of its proper divisors (1).

102222100101221 is an equidigital number, since it uses as much as digits as its factorization.

102222100101221 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 102222100101221 its reverse (122101001222201), we get a palindrome (224323101323422).

The spelling of 102222100101221 in words is "one hundred two trillion, two hundred twenty-two billion, one hundred million, one hundred one thousand, two hundred twenty-one".