12211100123 has 4 divisors (see below), whose sum is σ = 12235377168. Its totient is φ = 12186823080.

The previous prime is 12211100009. The next prime is 12211100147. The reversal of 12211100123 is 32100111221.

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 12211100123 - 2²² = 12206905819 is a prime.

It is a super-2 number, since 2×12211100123² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12211100098 and 12211100107.

It is not an unprimeable number, because it can be changed into a prime (12211100423) 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, 12137768 + ... + 12138773.

It is an arithmetic number, because the mean of its divisors is an integer number (3058844292).

Almost surely, 2^12211100123 is an apocalyptic number.

12211100123 is a deficient number, since it is larger than the sum of its proper divisors (24277045).

12211100123 is an equidigital number, since it uses as much as digits as its factorization.

12211100123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24277044.

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

Adding to 12211100123 its reverse (32100111221), we get a palindrome (44311211344).

The spelling of 12211100123 in words is "twelve billion, two hundred eleven million, one hundred thousand, one hundred twenty-three".