205132021 has 2 divisors, whose sum is σ = 205132022. Its totient is φ = 205132020.

The previous prime is 205132007. The next prime is 205132043. The reversal of 205132021 is 120231502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 204347025 + 784996 = 14295^2 + 886^2 .

It is a cyclic number.

It is not a de Polignac number, because 205132021 - 2¹⁵ = 205099253 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 205131986 and 205132004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205102021) 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, 102566010 + 102566011.

It is an arithmetic number, because the mean of its divisors is an integer number (102566011).

Almost surely, 2^205132021 is an apocalyptic number.

It is an amenable number.

205132021 is a deficient number, since it is larger than the sum of its proper divisors (1).

205132021 is an equidigital number, since it uses as much as digits as its factorization.

205132021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 205132021 is about 14322.4306945434. The cubic root of 205132021 is about 589.7634031716.

Adding to 205132021 its reverse (120231502), we get a palindrome (325363523).

The spelling of 205132021 in words is "two hundred five million, one hundred thirty-two thousand, twenty-one".