12022112021 has 4 divisors (see below), whose sum is σ = 12091604172. Its totient is φ = 11952619872.

The previous prime is 12022112017. The next prime is 12022112057. The reversal of 12022112021 is 12021122021.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4731513796 + 7290598225 = 68786^2 + 85385^2 .

It is a cyclic number.

It is not a de Polignac number, because 12022112021 - 2² = 12022112017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12022111987 and 12022112005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12022012021) 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, 34745816 + ... + 34746161.

It is an arithmetic number, because the mean of its divisors is an integer number (3022901043).

Almost surely, 2^12022112021 is an apocalyptic number.

It is an amenable number.

12022112021 is a deficient number, since it is larger than the sum of its proper divisors (69492151).

12022112021 is an equidigital number, since it uses as much as digits as its factorization.

12022112021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69492150.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 12022112021 its reverse (12021122021), we get a palindrome (24043234042).

The spelling of 12022112021 in words is "twelve billion, twenty-two million, one hundred twelve thousand, twenty-one".