2121242123 has 32 divisors (see below), whose sum is σ = 2853107712. Its totient is φ = 1523088000.

The previous prime is 2121242107. The next prime is 2121242143. The reversal of 2121242123 is 3212421212.

It is not a de Polignac number, because 2121242123 - 2⁴ = 2121242107 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2121242095 and 2121242104.

It is not an unprimeable number, because it can be changed into a prime (2121242143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 700190 + ... + 703212.

It is an arithmetic number, because the mean of its divisors is an integer number (89159616).

Almost surely, 2^2121242123 is an apocalyptic number.

2121242123 is a deficient number, since it is larger than the sum of its proper divisors (731865589).

2121242123 is a wasteful number, since it uses less digits than its factorization.

2121242123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3755.

The product of its digits is 384, while the sum is 20.

The square root of 2121242123 is about 46056.9443515307. The cubic root of 2121242123 is about 1284.8825003212.

Adding to 2121242123 its reverse (3212421212), we get a palindrome (5333663335).

Subtracting 2121242123 from its reverse (3212421212), we obtain a square (1091179089 = 33033²).

The spelling of 2121242123 in words is "two billion, one hundred twenty-one million, two hundred forty-two thousand, one hundred twenty-three".