102210221 has 2 divisors, whose sum is σ = 102210222. Its totient is φ = 102210220.

The previous prime is 102210211. The next prime is 102210223. The reversal of 102210221 is 122012201.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85285225 + 16924996 = 9235^2 + 4114^2 .

It is a cyclic number.

It is not a de Polignac number, because 102210221 - 2²⁶ = 35101357 is a prime.

Together with 102210223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102210223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51105110 + 51105111.

It is an arithmetic number, because the mean of its divisors is an integer number (51105111).

Almost surely, 2^102210221 is an apocalyptic number.

It is an amenable number.

102210221 is a deficient number, since it is larger than the sum of its proper divisors (1).

102210221 is an equidigital number, since it uses as much as digits as its factorization.

102210221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 102210221 is about 10109.9070717787. The cubic root of 102210221 is about 467.5536400271.

Adding to 102210221 its reverse (122012201), we get a palindrome (224222422).

The spelling of 102210221 in words is "one hundred two million, two hundred ten thousand, two hundred twenty-one".