2221221 has 8 divisors (see below), whose sum is σ = 3041824. Its totient is φ = 1440720.

The previous prime is 2221217. The next prime is 2221229. The reversal of 2221221 is 1221222.

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

It is not a de Polignac number, because 2221221 - 2² = 2221217 is a prime.

It is a Duffinian number.

2221221 is a modest number, since divided by 1221 gives 222 as remainder.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2221197 and 2221206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221229) 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, 9895 + ... + 10116.

It is an arithmetic number, because the mean of its divisors is an integer number (380228).

2^2221221 is an apocalyptic number.

It is an amenable number.

2221221 is a deficient number, since it is larger than the sum of its proper divisors (820603).

2221221 is a wasteful number, since it uses less digits than its factorization.

2221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20051.

The product of its digits is 32, while the sum is 12.

The square root of 2221221 is about 1490.3761270230. The cubic root of 2221221 is about 130.4759868325.

Adding to 2221221 its reverse (1221222), we get a palindrome (3442443).

Subtracting from 2221221 its reverse (1221222), we obtain a palindrome (999999).

It can be divided in two parts, 2221 and 221, that added together give a palindrome (2442).

The spelling of 2221221 in words is "two million, two hundred twenty-one thousand, two hundred twenty-one".