2212221 has 16 divisors (see below), whose sum is σ = 3294720. Its totient is φ = 1308720.
The previous prime is 2212219. The next prime is 2212229. The reversal of 2212221 is 1222122.
2212221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is not a de Polignac number, because 2212221 - 21 = 2212219 is a prime.
It is a junction number, because it is equal to n+sod(n) for n = 2212197 and 2212206.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (2212229) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 640 + ... + 2198.
It is an arithmetic number, because the mean of its divisors is an integer number (205920).
22212221 is an apocalyptic number.
It is an amenable number.
2212221 is a deficient number, since it is larger than the sum of its proper divisors (1082499).
2212221 is a wasteful number, since it uses less digits than its factorization.
2212221 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1616.
The product of its digits is 32, while the sum is 12.
The square root of 2212221 is about 1487.3536902835. The cubic root of 2212221 is about 130.2995263093.
Adding to 2212221 its reverse (1222122), we get a palindrome (3434343).
Subtracting from 2212221 its reverse (1222122), we obtain a palindrome (990099).
It can be divided in two parts, 221 and 2221, that added together give a palindrome (2442).
The spelling of 2212221 in words is "two million, two hundred twelve thousand, two hundred twenty-one".
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