12112211021 has 8 divisors (see below), whose sum is σ = 12835481400. Its totient is φ = 11409314560.

The previous prime is 12112210997. The next prime is 12112211047. The reversal of 12112211021 is 12011221121.

It can be written as a sum of positive squares in 4 ways, for example, as 86676100 + 12025534921 = 9310^2 + 109661^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12112211021 - 2²² = 12108016717 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12112210987 and 12112211005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12112211521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5092256 + ... + 5094633.

It is an arithmetic number, because the mean of its divisors is an integer number (1604435175).

Almost surely, 2^12112211021 is an apocalyptic number.

It is an amenable number.

12112211021 is a deficient number, since it is larger than the sum of its proper divisors (723270379).

12112211021 is a wasteful number, since it uses less digits than its factorization.

12112211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10186959.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 12112211021 its reverse (12011221121), we get a palindrome (24123432142).

The spelling of 12112211021 in words is "twelve billion, one hundred twelve million, two hundred eleven thousand, twenty-one".