206707902221 has 2 divisors, whose sum is σ = 206707902222. Its totient is φ = 206707902220.

The previous prime is 206707902091. The next prime is 206707902251. The reversal of 206707902221 is 122209707602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 169426084996 + 37281817225 = 411614^2 + 193085^2 .

It is a cyclic number.

It is not a de Polignac number, because 206707902221 - 2²⁶ = 206640793357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206707902251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103353951110 + 103353951111.

It is an arithmetic number, because the mean of its divisors is an integer number (103353951111).

Almost surely, 2^206707902221 is an apocalyptic number.

It is an amenable number.

206707902221 is a deficient number, since it is larger than the sum of its proper divisors (1).

206707902221 is an equidigital number, since it uses as much as digits as its factorization.

206707902221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 42336, while the sum is 38.

The spelling of 206707902221 in words is "two hundred six billion, seven hundred seven million, nine hundred two thousand, two hundred twenty-one".