204351751321 has 2 divisors, whose sum is σ = 204351751322. Its totient is φ = 204351751320.

The previous prime is 204351751283. The next prime is 204351751339. The reversal of 204351751321 is 123157153402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 185191654921 + 19160096400 = 430339^2 + 138420^2 .

It is a cyclic number.

It is not a de Polignac number, because 204351751321 - 2¹³ = 204351743129 is a prime.

It is not a weakly prime, because it can be changed into another prime (204351751621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102175875660 + 102175875661.

It is an arithmetic number, because the mean of its divisors is an integer number (102175875661).

Almost surely, 2^204351751321 is an apocalyptic number.

It is an amenable number.

204351751321 is a deficient number, since it is larger than the sum of its proper divisors (1).

204351751321 is an equidigital number, since it uses as much as digits as its factorization.

204351751321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25200, while the sum is 34.

The spelling of 204351751321 in words is "two hundred four billion, three hundred fifty-one million, seven hundred fifty-one thousand, three hundred twenty-one".