2122112221 has 4 divisors (see below), whose sum is σ = 2171463712. Its totient is φ = 2072760732.

The previous prime is 2122112219. The next prime is 2122112231. The reversal of 2122112221 is 1222112212.

It is a happy number.

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 2122112221 - 2¹ = 2122112219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2122112195 and 2122112204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2122112231) 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, 24675681 + ... + 24675766.

It is an arithmetic number, because the mean of its divisors is an integer number (542865928).

Almost surely, 2^2122112221 is an apocalyptic number.

It is an amenable number.

2122112221 is a deficient number, since it is larger than the sum of its proper divisors (49351491).

2122112221 is an equidigital number, since it uses as much as digits as its factorization.

2122112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49351490.

The product of its digits is 64, while the sum is 16.

The square root of 2122112221 is about 46066.3892767818. The cubic root of 2122112221 is about 1285.0581554022.

Adding to 2122112221 its reverse (1222112212), we get a palindrome (3344224433).

Subtracting from 2122112221 its reverse (1222112212), we obtain a palindrome (900000009).

The spelling of 2122112221 in words is "two billion, one hundred twenty-two million, one hundred twelve thousand, two hundred twenty-one".