2112123203221 has 2 divisors, whose sum is σ = 2112123203222. Its totient is φ = 2112123203220.

The previous prime is 2112123203213. The next prime is 2112123203233. The reversal of 2112123203221 is 1223023212112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1579259702596 + 532863500625 = 1256686^2 + 729975^2 .

It is a cyclic number.

It is not a de Polignac number, because 2112123203221 - 2³ = 2112123203213 is a prime.

It is a super-2 number, since 2×2112123203221² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2112123203192 and 2112123203201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2112123243221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1056061601610 + 1056061601611.

It is an arithmetic number, because the mean of its divisors is an integer number (1056061601611).

Almost surely, 2^{2112123203221} is an apocalyptic number.

It is an amenable number.

2112123203221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2112123203221 is an equidigital number, since it uses as much as digits as its factorization.

2112123203221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 2112123203221 its reverse (1223023212112), we get a palindrome (3335146415333).

The spelling of 2112123203221 in words is "two trillion, one hundred twelve billion, one hundred twenty-three million, two hundred three thousand, two hundred twenty-one".