2112211221 has 4 divisors (see below), whose sum is σ = 2816281632. Its totient is φ = 1408140812.

The previous prime is 2112211219. The next prime is 2112211243. The reversal of 2112211221 is 1221122112.

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 2112211221 - 2¹ = 2112211219 is a prime.

It is a super-2 number, since 2×2112211221² = 8922872484236621682, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2112211221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2112211721) 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, 352035201 + ... + 352035206.

It is an arithmetic number, because the mean of its divisors is an integer number (704070408).

Almost surely, 2^2112211221 is an apocalyptic number.

It is an amenable number.

2112211221 is a deficient number, since it is larger than the sum of its proper divisors (704070411).

2112211221 is an equidigital number, since it uses as much as digits as its factorization.

2112211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 704070410.

The product of its digits is 32, while the sum is 15.

The square root of 2112211221 is about 45958.7991683856. The cubic root of 2112211221 is about 1283.0565019494.

Adding to 2112211221 its reverse (1221122112), we get a palindrome (3333333333).

The spelling of 2112211221 in words is "two billion, one hundred twelve million, two hundred eleven thousand, two hundred twenty-one".