102243221 has 2 divisors, whose sum is σ = 102243222. Its totient is φ = 102243220.

The previous prime is 102243187. The next prime is 102243223. The reversal of 102243221 is 122342201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87142225 + 15100996 = 9335^2 + 3886^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102243221 is a prime.

Together with 102243223, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 102243221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102243223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51121610 + 51121611.

It is an arithmetic number, because the mean of its divisors is an integer number (51121611).

Almost surely, 2^102243221 is an apocalyptic number.

It is an amenable number.

102243221 is a deficient number, since it is larger than the sum of its proper divisors (1).

102243221 is an equidigital number, since it uses as much as digits as its factorization.

102243221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 102243221 is about 10111.5390025456. The cubic root of 102243221 is about 467.6039533576.

Adding to 102243221 its reverse (122342201), we get a palindrome (224585422).

The spelling of 102243221 in words is "one hundred two million, two hundred forty-three thousand, two hundred twenty-one".