2104002121 has 4 divisors (see below), whose sum is σ = 2265848452. Its totient is φ = 1942155792.

The previous prime is 2104002091. The next prime is 2104002149. The reversal of 2104002121 is 1212004012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 615585721 + 1488416400 = 24811^2 + 38580^2 .

It is a cyclic number.

It is not a de Polignac number, because 2104002121 - 2⁹ = 2104001609 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 161846317 = 2104002121 / (2 + 1 + 0 + 4 + 0 + 0 + 2 + 1 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2104002421) 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, 80923146 + ... + 80923171.

It is an arithmetic number, because the mean of its divisors is an integer number (566462113).

Almost surely, 2^2104002121 is an apocalyptic number.

It is an amenable number.

2104002121 is a deficient number, since it is larger than the sum of its proper divisors (161846331).

2104002121 is a wasteful number, since it uses less digits than its factorization.

2104002121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161846330.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 2104002121 is about 45869.4028847117. The cubic root of 2104002121 is about 1281.3921460187.

Adding to 2104002121 its reverse (1212004012), we get a palindrome (3316006133).

It can be divided in two parts, 210400 and 2121, that added together give a square (212521 = 461²).

The spelling of 2104002121 in words is "two billion, one hundred four million, two thousand, one hundred twenty-one".