2222221 has 4 divisors (see below), whose sum is σ = 2339200. Its totient is φ = 2105244.

The previous prime is 2222219. The next prime is 2222239. The reversal of 2222221 is 1222222.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1222222 = 2 ⋅611111.

It is a cyclic number.

It is not a de Polignac number, because 2222221 - 2¹ = 2222219 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2222251) 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, 58461 + ... + 58498.

It is an arithmetic number, because the mean of its divisors is an integer number (584800).

2^2222221 is an apocalyptic number.

It is an amenable number.

2222221 is a deficient number, since it is larger than the sum of its proper divisors (116979).

2222221 is a wasteful number, since it uses less digits than its factorization.

2222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116978.

The product of its digits is 64, while the sum is 13.

The square root of 2222221 is about 1490.7115750540. The cubic root of 2222221 is about 130.4955641148.

Adding to 2222221 its reverse (1222222), we get a palindrome (3444443).

Subtracting from 2222221 its reverse (1222222), we obtain a palindrome (999999).

The spelling of 2222221 in words is "two million, two hundred twenty-two thousand, two hundred twenty-one".