2121003123 has 16 divisors (see below), whose sum is σ = 2876054016. Its totient is φ = 1390004640.

The previous prime is 2121003097. The next prime is 2121003149. The reversal of 2121003123 is 3213001212.

It is an interprime number because it is at equal distance from previous prime (2121003097) and next prime (2121003149).

It is not a de Polignac number, because 2121003123 - 2²⁵ = 2087448691 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2121003173) 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, 610036 + ... + 613502.

It is an arithmetic number, because the mean of its divisors is an integer number (179753376).

Almost surely, 2^2121003123 is an apocalyptic number.

2121003123 is a deficient number, since it is larger than the sum of its proper divisors (755050893).

2121003123 is a wasteful number, since it uses less digits than its factorization.

2121003123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6874.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 2121003123 is about 46054.3496642825. The cubic root of 2121003123 is about 1284.8342426757.

Adding to 2121003123 its reverse (3213001212), we get a palindrome (5334004335).

The spelling of 2121003123 in words is "two billion, one hundred twenty-one million, three thousand, one hundred twenty-three".