205421341 has 2 divisors, whose sum is σ = 205421342. Its totient is φ = 205421340.

The previous prime is 205421339. The next prime is 205421351. The reversal of 205421341 is 143124502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 178329316 + 27092025 = 13354^2 + 5205^2 .

It is a cyclic number.

It is not a de Polignac number, because 205421341 - 2¹ = 205421339 is a prime.

Together with 205421339, it forms a pair of twin primes.

It is equal to p_11362441 and since 205421341 and 11362441 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205421311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102710670 + 102710671.

It is an arithmetic number, because the mean of its divisors is an integer number (102710671).

Almost surely, 2^205421341 is an apocalyptic number.

It is an amenable number.

205421341 is a deficient number, since it is larger than the sum of its proper divisors (1).

205421341 is an equidigital number, since it uses as much as digits as its factorization.

205421341 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 205421341 is about 14332.5273765655. The cubic root of 205421341 is about 590.0405420767.

Adding to 205421341 its reverse (143124502), we get a palindrome (348545843).

The spelling of 205421341 in words is "two hundred five million, four hundred twenty-one thousand, three hundred forty-one".