204122121 has 16 divisors (see below), whose sum is σ = 311291904. Its totient is φ = 116547984.

The previous prime is 204122101. The next prime is 204122143. The reversal of 204122121 is 121221402.

It is not a de Polignac number, because 204122121 - 2⁶ = 204122057 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 204122121.

It is not an unprimeable number, because it can be changed into a prime (204122101) 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, 29806 + ... + 36008.

It is an arithmetic number, because the mean of its divisors is an integer number (19455744).

Almost surely, 2^204122121 is an apocalyptic number.

204122121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

204122121 is a deficient number, since it is larger than the sum of its proper divisors (107169783).

204122121 is a wasteful number, since it uses less digits than its factorization.

204122121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7780.

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

The square root of 204122121 is about 14287.1313075789. The cubic root of 204122121 is about 588.7939751954.

Adding to 204122121 its reverse (121221402), we get a palindrome (325343523).

The spelling of 204122121 in words is "two hundred four million, one hundred twenty-two thousand, one hundred twenty-one".