206468021 has 2 divisors, whose sum is σ = 206468022. Its totient is φ = 206468020.

The previous prime is 206468011. The next prime is 206468099. The reversal of 206468021 is 120864602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 199204996 + 7263025 = 14114^2 + 2695^2 .

It is a cyclic number.

It is not a de Polignac number, because 206468021 - 2⁶ = 206467957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206468011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103234010 + 103234011.

It is an arithmetic number, because the mean of its divisors is an integer number (103234011).

Almost surely, 2^206468021 is an apocalyptic number.

It is an amenable number.

206468021 is a deficient number, since it is larger than the sum of its proper divisors (1).

206468021 is an equidigital number, since it uses as much as digits as its factorization.

206468021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 206468021 is about 14368.9951284006. The cubic root of 206468021 is about 591.0409861225.

The spelling of 206468021 in words is "two hundred six million, four hundred sixty-eight thousand, twenty-one".