204273721 has 2 divisors, whose sum is σ = 204273722. Its totient is φ = 204273720.

The previous prime is 204273701. The next prime is 204273737. The reversal of 204273721 is 127372402.

204273721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 187142400 + 17131321 = 13680^2 + 4139^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204273721 is a prime.

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 204273721.

It is not a weakly prime, because it can be changed into another prime (204273701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102136860 + 102136861.

It is an arithmetic number, because the mean of its divisors is an integer number (102136861).

Almost surely, 2^204273721 is an apocalyptic number.

It is an amenable number.

204273721 is a deficient number, since it is larger than the sum of its proper divisors (1).

204273721 is an equidigital number, since it uses as much as digits as its factorization.

204273721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4704, while the sum is 28.

The square root of 204273721 is about 14292.4357966023. The cubic root of 204273721 is about 588.9397034445.

The spelling of 204273721 in words is "two hundred four million, two hundred seventy-three thousand, seven hundred twenty-one".