12112100000021 has 4 divisors (see below), whose sum is σ = 13842400000032. Its totient is φ = 10381800000012.

The previous prime is 12112099999999. The next prime is 12112100000053. The reversal of 12112100000021 is 12000000121121.

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 not a de Polignac number, because 12112100000021 - 2²² = 12112095805717 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12112099999948 and 12112100000011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12112100000521) 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, 865149999995 + ... + 865150000008.

It is an arithmetic number, because the mean of its divisors is an integer number (3460600000008).

Almost surely, 2^{12112100000021} is an apocalyptic number.

It is an amenable number.

12112100000021 is a deficient number, since it is larger than the sum of its proper divisors (1730300000011).

12112100000021 is an equidigital number, since it uses as much as digits as its factorization.

12112100000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1730300000010.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 12112100000021 its reverse (12000000121121), we get a palindrome (24112100121142).

The spelling of 12112100000021 in words is "twelve trillion, one hundred twelve billion, one hundred million, twenty-one", and thus it is an aban number.