205354324121 has 2 divisors, whose sum is σ = 205354324122. Its totient is φ = 205354324120.

The previous prime is 205354324111. The next prime is 205354324127. The reversal of 205354324121 is 121423453502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 168953881600 + 36400442521 = 411040^2 + 190789^2 .

It is a cyclic number.

It is not a de Polignac number, because 205354324121 - 2¹⁸ = 205354061977 is a prime.

It is not a weakly prime, because it can be changed into another prime (205354324127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102677162060 + 102677162061.

It is an arithmetic number, because the mean of its divisors is an integer number (102677162061).

Almost surely, 2^205354324121 is an apocalyptic number.

It is an amenable number.

205354324121 is a deficient number, since it is larger than the sum of its proper divisors (1).

205354324121 is an equidigital number, since it uses as much as digits as its factorization.

205354324121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28800, while the sum is 32.

Adding to 205354324121 its reverse (121423453502), we get a palindrome (326777777623).

The spelling of 205354324121 in words is "two hundred five billion, three hundred fifty-four million, three hundred twenty-four thousand, one hundred twenty-one".