2112221221 has 8 divisors (see below), whose sum is σ = 2304922464. Its totient is φ = 1919633520.

The previous prime is 2112221213. The next prime is 2112221227. The reversal of 2112221221 is 1221222112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2112221221 - 2³ = 2112221213 is a prime.

It is a super-2 number, since 2×2112221221² = 8922956972885461682, 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 = 2112221195 and 2112221204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2112221227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13170 + ... + 66316.

It is an arithmetic number, because the mean of its divisors is an integer number (288115308).

Almost surely, 2^2112221221 is an apocalyptic number.

It is an amenable number.

2112221221 is a deficient number, since it is larger than the sum of its proper divisors (192701243).

2112221221 is a wasteful number, since it uses less digits than its factorization.

2112221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56771.

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

The square root of 2112221221 is about 45958.9079613517. The cubic root of 2112221221 is about 1283.0585267697.

Adding to 2112221221 its reverse (1221222112), we get a palindrome (3333443333).

The spelling of 2112221221 in words is "two billion, one hundred twelve million, two hundred twenty-one thousand, two hundred twenty-one".