2213232221 has 4 divisors (see below), whose sum is σ = 2213348700. Its totient is φ = 2213115744.

The previous prime is 2213232211. The next prime is 2213232269. The reversal of 2213232221 is 1222323122.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1222323122 = 2 ⋅611161561.

It can be written as a sum of positive squares in 2 ways, for example, as 132595225 + 2080636996 = 11515^2 + 45614^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2213232221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2213232193 and 2213232202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2213232211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22376 + ... + 70193.

It is an arithmetic number, because the mean of its divisors is an integer number (553337175).

Almost surely, 2^2213232221 is an apocalyptic number.

It is an amenable number.

2213232221 is a deficient number, since it is larger than the sum of its proper divisors (116479).

2213232221 is an equidigital number, since it uses as much as digits as its factorization.

2213232221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116478.

The product of its digits is 576, while the sum is 20.

The square root of 2213232221 is about 47045.0020831119. The cubic root of 2213232221 is about 1303.1937687973.

Adding to 2213232221 its reverse (1222323122), we get a palindrome (3435555343).

Subtracting from 2213232221 its reverse (1222323122), we obtain a palindrome (990909099).

The spelling of 2213232221 in words is "two billion, two hundred thirteen million, two hundred thirty-two thousand, two hundred twenty-one".