206131121 has 16 divisors (see below), whose sum is σ = 248844288. Its totient is φ = 167000400.

The previous prime is 206131117. The next prime is 206131127. The reversal of 206131121 is 121131602.

206131121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 206131121 - 2² = 206131117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 206131121.

It is not an unprimeable number, because it can be changed into a prime (206131127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1715 + ... + 20376.

It is an arithmetic number, because the mean of its divisors is an integer number (15552768).

Almost surely, 2^206131121 is an apocalyptic number.

It is an amenable number.

206131121 is a deficient number, since it is larger than the sum of its proper divisors (42713167).

206131121 is a wasteful number, since it uses less digits than its factorization.

206131121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22172.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 206131121 is about 14357.2671842520. The cubic root of 206131121 is about 590.7193380696.

Adding to 206131121 its reverse (121131602), we get a palindrome (327262723).

The spelling of 206131121 in words is "two hundred six million, one hundred thirty-one thousand, one hundred twenty-one".