205021133 has 4 divisors (see below), whose sum is σ = 205612320. Its totient is φ = 204429948.

The previous prime is 205021129. The next prime is 205021171. The reversal of 205021133 is 331120502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 331120502 = 2 ⋅165560251.

It is a cyclic number.

It is not a de Polignac number, because 205021133 - 2² = 205021129 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205021123) 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, 295073 + ... + 295766.

It is an arithmetic number, because the mean of its divisors is an integer number (51403080).

Almost surely, 2^205021133 is an apocalyptic number.

It is an amenable number.

205021133 is a deficient number, since it is larger than the sum of its proper divisors (591187).

205021133 is an equidigital number, since it uses as much as digits as its factorization.

205021133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 591186.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 205021133 is about 14318.5590406298. The cubic root of 205021133 is about 589.6571147572.

Adding to 205021133 its reverse (331120502), we get a palindrome (536141635).

The spelling of 205021133 in words is "two hundred five million, twenty-one thousand, one hundred thirty-three".