1322222221 has 4 divisors (see below), whose sum is σ = 1325090844. Its totient is φ = 1319353600.

The previous prime is 1322222197. The next prime is 1322222233. The reversal of 1322222221 is 1222222231.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 361532196 + 960690025 = 19014^2 + 30995^2 .

It is a cyclic number.

It is not a de Polignac number, because 1322222221 - 2⁹ = 1322221709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1322222621) 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, 1433620 + ... + 1434541.

It is an arithmetic number, because the mean of its divisors is an integer number (331272711).

Almost surely, 2^1322222221 is an apocalyptic number.

It is an amenable number.

1322222221 is a deficient number, since it is larger than the sum of its proper divisors (2868623).

1322222221 is an equidigital number, since it uses as much as digits as its factorization.

1322222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2868622.

The product of its digits is 384, while the sum is 19.

The square root of 1322222221 is about 36362.3736986462. The cubic root of 1322222221 is about 1097.5765437661.

Adding to 1322222221 its reverse (1222222231), we get a palindrome (2544444452).

The spelling of 1322222221 in words is "one billion, three hundred twenty-two million, two hundred twenty-two thousand, two hundred twenty-one".