2112213221 has 4 divisors (see below), whose sum is σ = 2112813600. Its totient is φ = 2111612844.

The previous prime is 2112213203. The next prime is 2112213247. The reversal of 2112213221 is 1223122112.

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 a cyclic number.

It is not a de Polignac number, because 2112213221 - 2¹⁸ = 2111951077 is a prime.

It is a super-2 number, since 2×2112213221² = 8922889381934389682, which 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 2112213221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2112213721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 294881 + ... + 301958.

It is an arithmetic number, because the mean of its divisors is an integer number (528203400).

Almost surely, 2^2112213221 is an apocalyptic number.

It is an amenable number.

2112213221 is a deficient number, since it is larger than the sum of its proper divisors (600379).

2112213221 is an equidigital number, since it uses as much as digits as its factorization.

2112213221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 600378.

The product of its digits is 96, while the sum is 17.

The square root of 2112213221 is about 45958.8209269994. The cubic root of 2112213221 is about 1283.0569069139.

Adding to 2112213221 its reverse (1223122112), we get a palindrome (3335335333).

It can be divided in two parts, 21122 and 13221, that added together give a palindrome (34343).

The spelling of 2112213221 in words is "two billion, one hundred twelve million, two hundred thirteen thousand, two hundred twenty-one".