206296021 has 2 divisors, whose sum is σ = 206296022. Its totient is φ = 206296020.

The previous prime is 206296009. The next prime is 206296031. The reversal of 206296021 is 120692602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 175271121 + 31024900 = 13239^2 + 5570^2 .

It is a cyclic number.

It is not a de Polignac number, because 206296021 - 2⁵ = 206295989 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206296001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103148010 + 103148011.

It is an arithmetic number, because the mean of its divisors is an integer number (103148011).

Almost surely, 2^206296021 is an apocalyptic number.

It is an amenable number.

206296021 is a deficient number, since it is larger than the sum of its proper divisors (1).

206296021 is an equidigital number, since it uses as much as digits as its factorization.

206296021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 206296021 is about 14363.0087725379. The cubic root of 206296021 is about 590.8768165632.

The spelling of 206296021 in words is "two hundred six million, two hundred ninety-six thousand, twenty-one".