12112021 has 4 divisors (see below), whose sum is σ = 12232044. Its totient is φ = 11992000.

The previous prime is 12112019. The next prime is 12112027. The reversal of 12112021 is 12021121.

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 8328996 + 3783025 = 2886^2 + 1945^2 .

It is a cyclic number.

It is not a de Polignac number, because 12112021 - 2¹ = 12112019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12111989 and 12112007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12112027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59860 + ... + 60061.

It is an arithmetic number, because the mean of its divisors is an integer number (3058011).

Almost surely, 2^12112021 is an apocalyptic number.

It is an amenable number.

12112021 is a deficient number, since it is larger than the sum of its proper divisors (120023).

12112021 is a wasteful number, since it uses less digits than its factorization.

12112021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120022.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 12112021 is about 3480.2328945058. The cubic root of 12112021 is about 229.6530433542.

Adding to 12112021 its reverse (12021121), we get a palindrome (24133142).

It can be divided in two parts, 121 and 12021, that multiplied together give a palindrome (1454541).

The spelling of 12112021 in words is "twelve million, one hundred twelve thousand, twenty-one".