204029921 has 2 divisors, whose sum is σ = 204029922. Its totient is φ = 204029920.

The previous prime is 204029893. The next prime is 204029927. The reversal of 204029921 is 129920402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 194909521 + 9120400 = 13961^2 + 3020^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204029921 is a prime.

It is not a weakly prime, because it can be changed into another prime (204029927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102014960 + 102014961.

It is an arithmetic number, because the mean of its divisors is an integer number (102014961).

Almost surely, 2^204029921 is an apocalyptic number.

It is an amenable number.

204029921 is a deficient number, since it is larger than the sum of its proper divisors (1).

204029921 is an equidigital number, since it uses as much as digits as its factorization.

204029921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 204029921 is about 14283.9042631908. The cubic root of 204029921 is about 588.7053109848.

The spelling of 204029921 in words is "two hundred four million, twenty-nine thousand, nine hundred twenty-one".