203124221 has 2 divisors, whose sum is σ = 203124222. Its totient is φ = 203124220.

The previous prime is 203124203. The next prime is 203124223. The reversal of 203124221 is 122421302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 188760121 + 14364100 = 13739^2 + 3790^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-203124221 is a prime.

Together with 203124223, 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 203124221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (203124223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101562110 + 101562111.

It is an arithmetic number, because the mean of its divisors is an integer number (101562111).

Almost surely, 2^203124221 is an apocalyptic number.

It is an amenable number.

203124221 is a deficient number, since it is larger than the sum of its proper divisors (1).

203124221 is an equidigital number, since it uses as much as digits as its factorization.

203124221 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 203124221 is about 14252.1654845851. The cubic root of 203124221 is about 587.8329204668.

Adding to 203124221 its reverse (122421302), we get a palindrome (325545523).

The spelling of 203124221 in words is "two hundred three million, one hundred twenty-four thousand, two hundred twenty-one".