12123232121 has 48 divisors (see below), whose sum is σ = 16646458752. Its totient is φ = 8589335040.

The previous prime is 12123232111. The next prime is 12123232139.

12123232121 is nontrivially palindromic in base 10.

12123232121 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is not a de Polignac number, because 12123232121 - 2⁶ = 12123232057 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 12123232093 and 12123232102.

It is not an unprimeable number, because it can be changed into a prime (12123232111) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 729521 + ... + 745953.

It is an arithmetic number, because the mean of its divisors is an integer number (346801224).

Almost surely, 2^12123232121 is an apocalyptic number.

12123232121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12123232121 is a deficient number, since it is larger than the sum of its proper divisors (4523226631).

12123232121 is a wasteful number, since it uses less digits than its factorization.

12123232121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16542 (or 16531 counting only the distinct ones).

The product of its digits is 288, while the sum is 20.

The spelling of 12123232121 in words is "twelve billion, one hundred twenty-three million, two hundred thirty-two thousand, one hundred twenty-one".