12211445123 has 4 divisors (see below), whose sum is σ = 12230437128. Its totient is φ = 12192453120.

The previous prime is 12211445087. The next prime is 12211445203. The reversal of 12211445123 is 32154411221.

It is a happy number.

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 12211445123 - 2⁸ = 12211444867 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12211445092 and 12211445101.

It is not an unprimeable number, because it can be changed into a prime (12211445023) 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, 9495038 + ... + 9496323.

It is an arithmetic number, because the mean of its divisors is an integer number (3057609282).

Almost surely, 2^12211445123 is an apocalyptic number.

12211445123 is a deficient number, since it is larger than the sum of its proper divisors (18992005).

12211445123 is an equidigital number, since it uses as much as digits as its factorization.

12211445123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18992004.

The product of its digits is 1920, while the sum is 26.

Adding to 12211445123 its reverse (32154411221), we get a palindrome (44365856344).

The spelling of 12211445123 in words is "twelve billion, two hundred eleven million, four hundred forty-five thousand, one hundred twenty-three".