2112110112221 has 4 divisors (see below), whose sum is σ = 2127526974492. Its totient is φ = 2096693249952.

The previous prime is 2112110112199. The next prime is 2112110112241. The reversal of 2112110112221 is 1222110112112.

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 1602728148121 + 509381964100 = 1265989^2 + 713710^2 .

It is a cyclic number.

It is not a de Polignac number, because 2112110112221 - 2¹⁸ = 2112109850077 is a prime.

It is a super-2 number, since 2×2112110112221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2112110112221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2112110112241) 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, 7708430930 + ... + 7708431203.

It is an arithmetic number, because the mean of its divisors is an integer number (531881743623).

Almost surely, 2^{2112110112221} is an apocalyptic number.

It is an amenable number.

2112110112221 is a deficient number, since it is larger than the sum of its proper divisors (15416862271).

2112110112221 is a wasteful number, since it uses less digits than its factorization.

2112110112221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15416862270.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 2112110112221 its reverse (1222110112112), we get a palindrome (3334220224333).

The spelling of 2112110112221 in words is "two trillion, one hundred twelve billion, one hundred ten million, one hundred twelve thousand, two hundred twenty-one".