204012221 has 4 divisors (see below), whose sum is σ = 233156832. Its totient is φ = 174867612.

The previous prime is 204012199. The next prime is 204012229. The reversal of 204012221 is 122210402.

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: 122210402 = 2 ⋅61105201.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204012221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 204012196 and 204012205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204012229) 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, 14572295 + ... + 14572308.

It is an arithmetic number, because the mean of its divisors is an integer number (58289208).

Almost surely, 2^204012221 is an apocalyptic number.

It is an amenable number.

204012221 is a deficient number, since it is larger than the sum of its proper divisors (29144611).

204012221 is an equidigital number, since it uses as much as digits as its factorization.

204012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29144610.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 204012221 is about 14283.2846712512. The cubic root of 204012221 is about 588.6882867083.

Adding to 204012221 its reverse (122210402), we get a palindrome (326222623).

It can be divided in two parts, 20401 and 2221, that added together give a palindrome (22622).

The spelling of 204012221 in words is "two hundred four million, twelve thousand, two hundred twenty-one".