206021 has 2 divisors, whose sum is σ = 206022. Its totient is φ = 206020.

The previous prime is 206009. The next prime is 206027. The reversal of 206021 is 120602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122500 + 83521 = 350^2 + 289^2 .

It is a cyclic number.

It is not a de Polignac number, because 206021 - 2⁶ = 205957 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 205993 and 206011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103010 + 103011.

It is an arithmetic number, because the mean of its divisors is an integer number (103011).

2²⁰⁶⁰²¹ is an apocalyptic number.

It is an amenable number.

206021 is a deficient number, since it is larger than the sum of its proper divisors (1).

206021 is an equidigital number, since it uses as much as digits as its factorization.

206021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 206021 is about 453.8953623909. The cubic root of 206021 is about 59.0614126411.

Adding to 206021 its reverse (120602), we get a palindrome (326623).

The spelling of 206021 in words is "two hundred six thousand, twenty-one".