2112211121 has 6 divisors (see below), whose sum is σ = 2243767830. Its totient is φ = 1987963136.

The previous prime is 2112211111. The next prime is 2112211139. The reversal of 2112211121 is 1211122112.

It can be written as a sum of positive squares in 3 ways, for example, as 401561521 + 1710649600 = 20039^2 + 41360^2 .

It is not a de Polignac number, because 2112211121 - 2¹⁴ = 2112194737 is a prime.

It is a super-2 number, since 2×2112211121² = 8922871639352153282, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2112211096 and 2112211105.

It is not an unprimeable number, because it can be changed into a prime (2112211111) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3654056 + ... + 3654633.

It is an arithmetic number, because the mean of its divisors is an integer number (373961305).

Almost surely, 2^2112211121 is an apocalyptic number.

It is an amenable number.

2112211121 is a deficient number, since it is larger than the sum of its proper divisors (131556709).

2112211121 is an equidigital number, since it uses as much as digits as its factorization.

2112211121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7308723 (or 7308706 counting only the distinct ones).

The product of its digits is 16, while the sum is 14.

The square root of 2112211121 is about 45958.7980804546. The cubic root of 2112211121 is about 1283.0564817011.

Adding to 2112211121 its reverse (1211122112), we get a palindrome (3323333233).

The spelling of 2112211121 in words is "two billion, one hundred twelve million, two hundred eleven thousand, one hundred twenty-one".