12112101100021 has 4 divisors (see below), whose sum is σ = 13043801184652. Its totient is φ = 11180401015392.

The previous prime is 12112101099977. The next prime is 12112101100037. The reversal of 12112101100021 is 12000110121121.

It is a happy number.

12112101100021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 6575562689796 + 5536538410225 = 2564286^2 + 2352985^2 .

It is a cyclic number.

It is not a de Polignac number, because 12112101100021 - 2¹⁷ = 12112100968949 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 931700084617 = 12112101100021 / (1 + 2 + 1 + 1 + 2 + 1 + 0 + 1 + 1 + 0 + 0 + 0 + 2 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12112101099974 and 12112101100010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12112107100021) 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, 465850042296 + ... + 465850042321.

It is an arithmetic number, because the mean of its divisors is an integer number (3260950296163).

Almost surely, 2^{12112101100021} is an apocalyptic number.

It is an amenable number.

12112101100021 is a deficient number, since it is larger than the sum of its proper divisors (931700084631).

12112101100021 is an equidigital number, since it uses as much as digits as its factorization.

12112101100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 931700084630.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 12112101100021 its reverse (12000110121121), we get a palindrome (24112211221142).

The spelling of 12112101100021 in words is "twelve trillion, one hundred twelve billion, one hundred one million, one hundred thousand, twenty-one".