204343121 has 2 divisors, whose sum is σ = 204343122. Its totient is φ = 204343120.

The previous prime is 204343093. The next prime is 204343123. The reversal of 204343121 is 121343402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 187827025 + 16516096 = 13705^2 + 4064^2 .

It is a cyclic number.

It is not a de Polignac number, because 204343121 - 2¹⁸ = 204080977 is a prime.

It is a super-2 number, since 2×204343121² = 83512222200041282, which contains 22 as substring.

Together with 204343123, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 204343093 and 204343102.

It is not a weakly prime, because it can be changed into another prime (204343123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102171560 + 102171561.

It is an arithmetic number, because the mean of its divisors is an integer number (102171561).

Almost surely, 2^204343121 is an apocalyptic number.

It is an amenable number.

204343121 is a deficient number, since it is larger than the sum of its proper divisors (1).

204343121 is an equidigital number, since it uses as much as digits as its factorization.

204343121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 204343121 is about 14294.8634481061. The cubic root of 204343121 is about 589.0063913954.

Adding to 204343121 its reverse (121343402), we get a palindrome (325686523).

The spelling of 204343121 in words is "two hundred four million, three hundred forty-three thousand, one hundred twenty-one".