12021442123 has 4 divisors (see below), whose sum is σ = 12435974640. Its totient is φ = 11606909608.

The previous prime is 12021442109. The next prime is 12021442129. The reversal of 12021442123 is 32124412021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32124412021 = 13 ⋅2471108617.

It is a cyclic number.

It is not a de Polignac number, because 12021442123 - 2³³ = 3431507531 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12021442094 and 12021442103.

It is not an unprimeable number, because it can be changed into a prime (12021442129) 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, 207266215 + ... + 207266272.

It is an arithmetic number, because the mean of its divisors is an integer number (3108993660).

Almost surely, 2^12021442123 is an apocalyptic number.

12021442123 is a deficient number, since it is larger than the sum of its proper divisors (414532517).

12021442123 is an equidigital number, since it uses as much as digits as its factorization.

12021442123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414532516.

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 12021442123 its reverse (32124412021), we get a palindrome (44145854144).

The spelling of 12021442123 in words is "twelve billion, twenty-one million, four hundred forty-two thousand, one hundred twenty-three".