204226621 has 2 divisors, whose sum is σ = 204226622. Its totient is φ = 204226620.

The previous prime is 204226619. The next prime is 204226681. The reversal of 204226621 is 126622402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 137804121 + 66422500 = 11739^2 + 8150^2 .

It is a cyclic number.

It is not a de Polignac number, because 204226621 - 2¹ = 204226619 is a prime.

Together with 204226619, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204226681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102113310 + 102113311.

It is an arithmetic number, because the mean of its divisors is an integer number (102113311).

Almost surely, 2^204226621 is an apocalyptic number.

It is an amenable number.

204226621 is a deficient number, since it is larger than the sum of its proper divisors (1).

204226621 is an equidigital number, since it uses as much as digits as its factorization.

204226621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 204226621 is about 14290.7879768752. The cubic root of 204226621 is about 588.8944354382.

The spelling of 204226621 in words is "two hundred four million, two hundred twenty-six thousand, six hundred twenty-one".