12112102021 has 4 divisors (see below), whose sum is σ = 12112325344. Its totient is φ = 12111878700.

The previous prime is 12112101983. The next prime is 12112102027. The reversal of 12112102021 is 12020121121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12112102021 is a prime.

It is a super-2 number, since 2×12112102021² (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 = 12112101992 and 12112102010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12112102027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27526 + ... + 158056.

It is an arithmetic number, because the mean of its divisors is an integer number (3028081336).

Almost surely, 2^12112102021 is an apocalyptic number.

It is an amenable number.

12112102021 is a deficient number, since it is larger than the sum of its proper divisors (223323).

12112102021 is an equidigital number, since it uses as much as digits as its factorization.

12112102021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223322.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 12112102021 its reverse (12020121121), we get a palindrome (24132223142).

The spelling of 12112102021 in words is "twelve billion, one hundred twelve million, one hundred two thousand, twenty-one".