204343111221 has 96 divisors (see below), whose sum is σ = 299177463168. Its totient is φ = 124000665600.

The previous prime is 204343111201. The next prime is 204343111223. The reversal of 204343111221 is 122111343402.

It is not a de Polignac number, because 204343111221 - 2³³ = 195753176629 is a prime.

It is a super-2 number, since 2×204343111221² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 204343111191 and 204343111200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204343111223) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1058772501 + ... + 1058772693.

It is an arithmetic number, because the mean of its divisors is an integer number (3116431908).

Almost surely, 2^204343111221 is an apocalyptic number.

It is an amenable number.

204343111221 is a deficient number, since it is larger than the sum of its proper divisors (94834351947).

204343111221 is a wasteful number, since it uses less digits than its factorization.

204343111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 551 (or 534 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 204343111221 its reverse (122111343402), we get a palindrome (326454454623).

The spelling of 204343111221 in words is "two hundred four billion, three hundred forty-three million, one hundred eleven thousand, two hundred twenty-one".