205434321 has 16 divisors (see below), whose sum is σ = 291907584. Its totient is φ = 128212304.

The previous prime is 205434293. The next prime is 205434391. The reversal of 205434321 is 123434502.

It is not a de Polignac number, because 205434321 - 2¹¹ = 205432273 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 205434291 and 205434300.

It is not an unprimeable number, because it can be changed into a prime (205434391) 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, 28431 + ... + 34916.

It is an arithmetic number, because the mean of its divisors is an integer number (18244224).

Almost surely, 2^205434321 is an apocalyptic number.

It is an amenable number.

205434321 is a deficient number, since it is larger than the sum of its proper divisors (86473263).

205434321 is a wasteful number, since it uses less digits than its factorization.

205434321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63420.

The product of its (nonzero) digits is 2880, while the sum is 24.

The square root of 205434321 is about 14332.9801855720. The cubic root of 205434321 is about 590.0529694854.

Adding to 205434321 its reverse (123434502), we get a palindrome (328868823).

The spelling of 205434321 in words is "two hundred five million, four hundred thirty-four thousand, three hundred twenty-one".