1804112121 has 8 divisors (see below), whose sum is σ = 2749123264. Its totient is φ = 1030921200.

The previous prime is 1804112113. The next prime is 1804112143. The reversal of 1804112121 is 1212114081.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1804112121 - 2³ = 1804112113 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 85910101 = 1804112121 / (1 + 8 + 0 + 4 + 1 + 1 + 2 + 1 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1804112621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42955030 + ... + 42955071.

It is an arithmetic number, because the mean of its divisors is an integer number (343640408).

Almost surely, 2^1804112121 is an apocalyptic number.

It is an amenable number.

1804112121 is a deficient number, since it is larger than the sum of its proper divisors (945011143).

1804112121 is an equidigital number, since it uses as much as digits as its factorization.

1804112121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85910111.

The product of its (nonzero) digits is 128, while the sum is 21.

The square root of 1804112121 is about 42474.8410356060. The cubic root of 1804112121 is about 1217.3660187037.

The spelling of 1804112121 in words is "one billion, eight hundred four million, one hundred twelve thousand, one hundred twenty-one".