204031111121 has 4 divisors (see below), whose sum is σ = 204190138992. Its totient is φ = 203872083252.

The previous prime is 204031111103. The next prime is 204031111181. The reversal of 204031111121 is 121111130402.

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.

It is a cyclic number.

It is not a de Polignac number, because 204031111121 - 2¹⁴ = 204031094737 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 204031111121.

It is not an unprimeable number, because it can be changed into a prime (204031111181) 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, 79512011 + ... + 79514576.

It is an arithmetic number, because the mean of its divisors is an integer number (51047534748).

Almost surely, 2^204031111121 is an apocalyptic number.

It is an amenable number.

204031111121 is a deficient number, since it is larger than the sum of its proper divisors (159027871).

204031111121 is a wasteful number, since it uses less digits than its factorization.

204031111121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159027870.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 204031111121 its reverse (121111130402), we get a palindrome (325142241523).

The spelling of 204031111121 in words is "two hundred four billion, thirty-one million, one hundred eleven thousand, one hundred twenty-one".