2121004123 has 32 divisors (see below), whose sum is σ = 2509488000. Its totient is φ = 1755426816.

The previous prime is 2121004121. The next prime is 2121004147. The reversal of 2121004123 is 3214001212.

It is a cyclic number.

It is not a de Polignac number, because 2121004123 - 2¹ = 2121004121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121004097 and 2121004106.

It is not an unprimeable number, because it can be changed into a prime (2121004121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6776215 + ... + 6776527.

It is an arithmetic number, because the mean of its divisors is an integer number (78421500).

Almost surely, 2^2121004123 is an apocalyptic number.

2121004123 is a deficient number, since it is larger than the sum of its proper divisors (388483877).

2121004123 is a wasteful number, since it uses less digits than its factorization.

2121004123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 631.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 2121004123 is about 46054.3605210191. The cubic root of 2121004123 is about 1284.8344445981.

Adding to 2121004123 its reverse (3214001212), we get a palindrome (5335005335).

The spelling of 2121004123 in words is "two billion, one hundred twenty-one million, four thousand, one hundred twenty-three".