206436121 has 16 divisors (see below), whose sum is σ = 222168960. Its totient is φ = 191237760.

The previous prime is 206436119. The next prime is 206436137. The reversal of 206436121 is 121634602.

It is a cyclic number.

It is not a de Polignac number, because 206436121 - 2¹ = 206436119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206436821) 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, 184255 + ... + 185371.

It is an arithmetic number, because the mean of its divisors is an integer number (13885560).

Almost surely, 2^206436121 is an apocalyptic number.

It is an amenable number.

206436121 is a deficient number, since it is larger than the sum of its proper divisors (15732839).

206436121 is a wasteful number, since it uses less digits than its factorization.

206436121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1344.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 206436121 is about 14367.8850566115. The cubic root of 206436121 is about 591.0105452848.

The spelling of 206436121 in words is "two hundred six million, four hundred thirty-six thousand, one hundred twenty-one".