12123120011 has 4 divisors (see below), whose sum is σ = 12195713712. Its totient is φ = 12050526312.

The previous prime is 12123119971. The next prime is 12123120073. The reversal of 12123120011 is 11002132121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12123120011 - 2³⁰ = 11049378187 is a prime.

It is a super-2 number, since 2×12123120011² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12123120311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36296600 + ... + 36296933.

It is an arithmetic number, because the mean of its divisors is an integer number (3048928428).

Almost surely, 2^12123120011 is an apocalyptic number.

12123120011 is a deficient number, since it is larger than the sum of its proper divisors (72593701).

12123120011 is an equidigital number, since it uses as much as digits as its factorization.

12123120011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72593700.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 12123120011 its reverse (11002132121), we get a palindrome (23125252132).

The spelling of 12123120011 in words is "twelve billion, one hundred twenty-three million, one hundred twenty thousand, eleven".