102221237 has 2 divisors, whose sum is σ = 102221238. Its totient is φ = 102221236.

The previous prime is 102221213. The next prime is 102221239. The reversal of 102221237 is 732122201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 100681156 + 1540081 = 10034^2 + 1241^2 .

It is an emirp because it is prime and its reverse (732122201) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102221237 is a prime.

Together with 102221239, 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 (102221239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51110618 + 51110619.

It is an arithmetic number, because the mean of its divisors is an integer number (51110619).

Almost surely, 2^102221237 is an apocalyptic number.

It is an amenable number.

102221237 is a deficient number, since it is larger than the sum of its proper divisors (1).

102221237 is an equidigital number, since it uses as much as digits as its factorization.

102221237 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 102221237 is about 10110.4518692292. The cubic root of 102221237 is about 467.5704367356.

Adding to 102221237 its reverse (732122201), we get a palindrome (834343438).

The spelling of 102221237 in words is "one hundred two million, two hundred twenty-one thousand, two hundred thirty-seven".