206844306121 has 4 divisors (see below), whose sum is σ = 210747028932. Its totient is φ = 202941583312.

The previous prime is 206844306107. The next prime is 206844306173. The reversal of 206844306121 is 121603448602.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 127509697225 + 79334608896 = 357085^2 + 281664^2 .

It is a cyclic number.

It is not a de Polignac number, because 206844306121 - 2¹⁵ = 206844273353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206844307121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1951361326 + ... + 1951361431.

It is an arithmetic number, because the mean of its divisors is an integer number (52686757233).

Almost surely, 2^206844306121 is an apocalyptic number.

It is an amenable number.

206844306121 is a deficient number, since it is larger than the sum of its proper divisors (3902722811).

206844306121 is an equidigital number, since it uses as much as digits as its factorization.

206844306121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3902722810.

The product of its (nonzero) digits is 55296, while the sum is 37.

The spelling of 206844306121 in words is "two hundred six billion, eight hundred forty-four million, three hundred six thousand, one hundred twenty-one".