204321145 has 16 divisors (see below), whose sum is σ = 280736640. Its totient is φ = 139843584.

The previous prime is 204321133. The next prime is 204321149. The reversal of 204321145 is 541123402.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204321145 is a prime.

It is a super-2 number, since 2×204321145² = 83494260588222050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (204321149) 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, 14521 + ... + 24889.

It is an arithmetic number, because the mean of its divisors is an integer number (17546040).

Almost surely, 2^204321145 is an apocalyptic number.

It is an amenable number.

204321145 is a deficient number, since it is larger than the sum of its proper divisors (76415495).

204321145 is a wasteful number, since it uses less digits than its factorization.

204321145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10944.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 204321145 is about 14294.0947597251. The cubic root of 204321145 is about 588.9852758187.

Adding to 204321145 its reverse (541123402), we get a palindrome (745444547).

The spelling of 204321145 in words is "two hundred four million, three hundred twenty-one thousand, one hundred forty-five".