2212222221 has 24 divisors (see below), whose sum is σ = 3509344800. Its totient is φ = 1331733600.

The previous prime is 2212222213. The next prime is 2212222249. The reversal of 2212222221 is 1222222122.

2212222221 is a `hidden beast` number, since 221 + 2 + 222 + 221 = 666.

It is not a de Polignac number, because 2212222221 - 2³ = 2212222213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2212222194 and 2212222203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2212222321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 60235 + ... + 89736.

It is an arithmetic number, because the mean of its divisors is an integer number (146222700).

Almost surely, 2^2212222221 is an apocalyptic number.

It is an amenable number.

2212222221 is a deficient number, since it is larger than the sum of its proper divisors (1297122579).

2212222221 is a wasteful number, since it uses less digits than its factorization.

2212222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150137 (or 150134 counting only the distinct ones).

The product of its digits is 256, while the sum is 18.

The square root of 2212222221 is about 47034.2664554259. The cubic root of 2212222221 is about 1302.9955028159.

Adding to 2212222221 its reverse (1222222122), we get a palindrome (3434444343).

Subtracting from 2212222221 its reverse (1222222122), we obtain a palindrome (990000099).

It can be divided in two parts, 22 and 12222221, that multiplied together give a palindrome (268888862).

The spelling of 2212222221 in words is "two billion, two hundred twelve million, two hundred twenty-two thousand, two hundred twenty-one".