206408121 has 8 divisors (see below), whose sum is σ = 275334624. Its totient is φ = 137543520.

The previous prime is 206408117. The next prime is 206408123. The reversal of 206408121 is 121804602.

206408121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 206408121 - 2² = 206408117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 206408091 and 206408100.

It is not an unprimeable number, because it can be changed into a prime (206408123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7036 + ... + 21501.

It is an arithmetic number, because the mean of its divisors is an integer number (34416828).

Almost surely, 2^206408121 is an apocalyptic number.

It is an amenable number.

206408121 is a deficient number, since it is larger than the sum of its proper divisors (68926503).

206408121 is a wasteful number, since it uses less digits than its factorization.

206408121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30951.

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 206408121 is about 14366.9106282457. The cubic root of 206408121 is about 590.9838234698.

The spelling of 206408121 in words is "two hundred six million, four hundred eight thousand, one hundred twenty-one".