205426121 has 4 divisors (see below), whose sum is σ = 205594500. Its totient is φ = 205257744.

The previous prime is 205426103. The next prime is 205426127. The reversal of 205426121 is 121624502.

It is a happy number.

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 104142025 + 101284096 = 10205^2 + 10064^2 .

It is a cyclic number.

It is not a de Polignac number, because 205426121 - 2¹⁰ = 205425097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205426127) 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, 82346 + ... + 84803.

It is an arithmetic number, because the mean of its divisors is an integer number (51398625).

Almost surely, 2^205426121 is an apocalyptic number.

It is an amenable number.

205426121 is a deficient number, since it is larger than the sum of its proper divisors (168379).

205426121 is a wasteful number, since it uses less digits than its factorization.

205426121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168378.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 205426121 is about 14332.6941291580. The cubic root of 205426121 is about 590.0451186409.

The spelling of 205426121 in words is "two hundred five million, four hundred twenty-six thousand, one hundred twenty-one".