2112123101213 has 4 divisors (see below), whose sum is σ = 2133035211228. Its totient is φ = 2091210991200.

The previous prime is 2112123101167. The next prime is 2112123101369. The reversal of 2112123101213 is 3121013212112.

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 1219527079684 + 892596021529 = 1104322^2 + 944773^2 .

It is a cyclic number.

It is not a de Polignac number, because 2112123101213 - 2⁸ = 2112123100957 is a prime.

It is a super-2 number, since 2×2112123101213² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2112123104213) 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, 10456054856 + ... + 10456055057.

It is an arithmetic number, because the mean of its divisors is an integer number (533258802807).

Almost surely, 2^{2112123101213} is an apocalyptic number.

It is an amenable number.

2112123101213 is a deficient number, since it is larger than the sum of its proper divisors (20912110015).

2112123101213 is a wasteful number, since it uses less digits than its factorization.

2112123101213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20912110014.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 2112123101213 its reverse (3121013212112), we get a palindrome (5233136313325).

The spelling of 2112123101213 in words is "two trillion, one hundred twelve billion, one hundred twenty-three million, one hundred one thousand, two hundred thirteen".