2121231123 has 24 divisors (see below), whose sum is σ = 3343996656. Its totient is φ = 1285036800.

The previous prime is 2121231121. The next prime is 2121231163. The reversal of 2121231123 is 3211321212.

It is not a de Polignac number, because 2121231123 - 2¹ = 2121231121 is a prime.

It is a super-2 number, since 2×2121231123² = 8999242954367682258, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2121231096 and 2121231105.

It is not an unprimeable number, because it can be changed into a prime (2121231121) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 414943 + ... + 420023.

It is an arithmetic number, because the mean of its divisors is an integer number (139333194).

Almost surely, 2^2121231123 is an apocalyptic number.

2121231123 is a deficient number, since it is larger than the sum of its proper divisors (1222765533).

2121231123 is a wasteful number, since it uses less digits than its factorization.

2121231123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9315 (or 9312 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 2121231123 is about 46056.8249339878. The cubic root of 2121231123 is about 1284.8802793376.

Adding to 2121231123 its reverse (3211321212), we get a palindrome (5332552335).

The spelling of 2121231123 in words is "two billion, one hundred twenty-one million, two hundred thirty-one thousand, one hundred twenty-three".