206935021 has 2 divisors, whose sum is σ = 206935022. Its totient is φ = 206935020.

The previous prime is 206935009. The next prime is 206935073. The reversal of 206935021 is 120539602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 148962025 + 57972996 = 12205^2 + 7614^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206935021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206933021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103467510 + 103467511.

It is an arithmetic number, because the mean of its divisors is an integer number (103467511).

Almost surely, 2^206935021 is an apocalyptic number.

It is an amenable number.

206935021 is a deficient number, since it is larger than the sum of its proper divisors (1).

206935021 is an equidigital number, since it uses as much as digits as its factorization.

206935021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 206935021 is about 14385.2362163435. The cubic root of 206935021 is about 591.4862662160.

The spelling of 206935021 in words is "two hundred six million, nine hundred thirty-five thousand, twenty-one".