206089021 has 2 divisors, whose sum is σ = 206089022. Its totient is φ = 206089020.

The previous prime is 206088997. The next prime is 206089043. The reversal of 206089021 is 120980602.

It is a happy number.

206089021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 185340996 + 20748025 = 13614^2 + 4555^2 .

It is a cyclic number.

It is not a de Polignac number, because 206089021 - 2⁷ = 206088893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206089621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103044510 + 103044511.

It is an arithmetic number, because the mean of its divisors is an integer number (103044511).

Almost surely, 2^206089021 is an apocalyptic number.

It is an amenable number.

206089021 is a deficient number, since it is larger than the sum of its proper divisors (1).

206089021 is an equidigital number, since it uses as much as digits as its factorization.

206089021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 206089021 is about 14355.8009529249. The cubic root of 206089021 is about 590.6791193692.

The spelling of 206089021 in words is "two hundred six million, eighty-nine thousand, twenty-one".