102210201221 has 2 divisors, whose sum is σ = 102210201222. Its totient is φ = 102210201220.

The previous prime is 102210201199. The next prime is 102210201257. The reversal of 102210201221 is 122102012201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72166912321 + 30043288900 = 268639^2 + 173330^2 .

It is a cyclic number.

It is not a de Polignac number, because 102210201221 - 2¹⁸ = 102209939077 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 102210201196 and 102210201205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102210201281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51105100610 + 51105100611.

It is an arithmetic number, because the mean of its divisors is an integer number (51105100611).

Almost surely, 2^102210201221 is an apocalyptic number.

It is an amenable number.

102210201221 is a deficient number, since it is larger than the sum of its proper divisors (1).

102210201221 is an equidigital number, since it uses as much as digits as its factorization.

102210201221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 102210201221 its reverse (122102012201), we get a palindrome (224312213422).

The spelling of 102210201221 in words is "one hundred two billion, two hundred ten million, two hundred one thousand, two hundred twenty-one".