102212222221 has 2 divisors, whose sum is σ = 102212222222. Its totient is φ = 102212222220.

The previous prime is 102212222213. The next prime is 102212222243. The reversal of 102212222221 is 122222212201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 95873833225 + 6338388996 = 309635^2 + 79614^2 .

It is an emirp because it is prime and its reverse (122222212201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 102212222221 - 2³ = 102212222213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102212222821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51106111110 + 51106111111.

It is an arithmetic number, because the mean of its divisors is an integer number (51106111111).

Almost surely, 2^102212222221 is an apocalyptic number.

It is an amenable number.

102212222221 is a deficient number, since it is larger than the sum of its proper divisors (1).

102212222221 is an equidigital number, since it uses as much as digits as its factorization.

102212222221 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 102212222221 its reverse (122222212201), we get a palindrome (224434434422).

The spelling of 102212222221 in words is "one hundred two billion, two hundred twelve million, two hundred twenty-two thousand, two hundred twenty-one".