206022860221 has 4 divisors (see below), whose sum is σ = 209097828352. Its totient is φ = 202947892092.

The previous prime is 206022860191. The next prime is 206022860231. The reversal of 206022860221 is 122068220602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 122068220602 = 2 ⋅61034110301.

It is a cyclic number.

It is not a de Polignac number, because 206022860221 - 2²⁷ = 205888642493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206022860231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1537483965 + ... + 1537484098.

It is an arithmetic number, because the mean of its divisors is an integer number (52274457088).

Almost surely, 2^206022860221 is an apocalyptic number.

It is an amenable number.

206022860221 is a deficient number, since it is larger than the sum of its proper divisors (3074968131).

206022860221 is an equidigital number, since it uses as much as digits as its factorization.

206022860221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3074968130.

The product of its (nonzero) digits is 9216, while the sum is 31.

The spelling of 206022860221 in words is "two hundred six billion, twenty-two million, eight hundred sixty thousand, two hundred twenty-one".