204121401 has 32 divisors (see below), whose sum is σ = 308689920. Its totient is φ = 118843200.

The previous prime is 204121373. The next prime is 204121417. The reversal of 204121401 is 104121402.

It is not a de Polignac number, because 204121401 - 2⁷ = 204121273 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (204121471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 251286 + ... + 252096.

It is an arithmetic number, because the mean of its divisors is an integer number (9646560).

Almost surely, 2^204121401 is an apocalyptic number.

It is an amenable number.

204121401 is a deficient number, since it is larger than the sum of its proper divisors (104568519).

204121401 is a wasteful number, since it uses less digits than its factorization.

204121401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1117.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 204121401 is about 14287.1061100560. The cubic root of 204121401 is about 588.7932829102.

Adding to 204121401 its reverse (104121402), we get a palindrome (308242803).

Subtracting from 204121401 its reverse (104121402), we obtain a palindrome (99999999).

The spelling of 204121401 in words is "two hundred four million, one hundred twenty-one thousand, four hundred one".