204035621 has 2 divisors, whose sum is σ = 204035622. Its totient is φ = 204035620.

The previous prime is 204035609. The next prime is 204035627. The reversal of 204035621 is 126530402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 184552225 + 19483396 = 13585^2 + 4414^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204035621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204035627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102017810 + 102017811.

It is an arithmetic number, because the mean of its divisors is an integer number (102017811).

Almost surely, 2^204035621 is an apocalyptic number.

It is an amenable number.

204035621 is a deficient number, since it is larger than the sum of its proper divisors (1).

204035621 is an equidigital number, since it uses as much as digits as its factorization.

204035621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 204035621 is about 14284.1037870774. The cubic root of 204035621 is about 588.7107931693.

The spelling of 204035621 in words is "two hundred four million, thirty-five thousand, six hundred twenty-one".