201223621 has 2 divisors, whose sum is σ = 201223622. Its totient is φ = 201223620.

The previous prime is 201223609. The next prime is 201223637. The reversal of 201223621 is 126322102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 177262596 + 23961025 = 13314^2 + 4895^2 .

It is a cyclic number.

It is not a de Polignac number, because 201223621 - 2⁹ = 201223109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201223601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100611810 + 100611811.

It is an arithmetic number, because the mean of its divisors is an integer number (100611811).

Almost surely, 2^201223621 is an apocalyptic number.

It is an amenable number.

201223621 is a deficient number, since it is larger than the sum of its proper divisors (1).

201223621 is an equidigital number, since it uses as much as digits as its factorization.

201223621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 201223621 is about 14185.3311910579. The cubic root of 201223621 is about 585.9937535007.

Adding to 201223621 its reverse (126322102), we get a palindrome (327545723).

The spelling of 201223621 in words is "two hundred one million, two hundred twenty-three thousand, six hundred twenty-one".