205141021 has 2 divisors, whose sum is σ = 205141022. Its totient is φ = 205141020.

The previous prime is 205141009. The next prime is 205141031. The reversal of 205141021 is 120141502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119115396 + 86025625 = 10914^2 + 9275^2 .

It is a cyclic number.

It is not a de Polignac number, because 205141021 - 2⁷ = 205140893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 205140986 and 205141004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205141031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102570510 + 102570511.

It is an arithmetic number, because the mean of its divisors is an integer number (102570511).

Almost surely, 2^205141021 is an apocalyptic number.

It is an amenable number.

205141021 is a deficient number, since it is larger than the sum of its proper divisors (1).

205141021 is an equidigital number, since it uses as much as digits as its factorization.

205141021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 205141021 is about 14322.7448835759. The cubic root of 205141021 is about 589.7720281748.

Adding to 205141021 its reverse (120141502), we get a palindrome (325282523).

The spelling of 205141021 in words is "two hundred five million, one hundred forty-one thousand, twenty-one".