1222222220 has 12 divisors (see below), whose sum is σ = 2566666704. Its totient is φ = 488888880.

The previous prime is 1222222189. The next prime is 1222222223. The reversal of 1222222220 is 222222221.

It is not an unprimeable number, because it can be changed into a prime (1222222223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30555536 + ... + 30555575.

It is an arithmetic number, because the mean of its divisors is an integer number (213888892).

Almost surely, 2^1222222220 is an apocalyptic number.

1222222220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1222222220 is an abundant number, since it is smaller than the sum of its proper divisors (1344444484).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1222222220 is a wasteful number, since it uses less digits than its factorization.

1222222220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61111120 (or 61111118 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 1222222220 is about 34960.2949072230. The cubic root of 1222222220 is about 1069.1781093506.

Adding to 1222222220 its reverse (222222221), we get a palindrome (1444444441).

Subtracting from 1222222220 its reverse (222222221), we obtain a palindrome (999999999).

The spelling of 1222222220 in words is "one billion, two hundred twenty-two million, two hundred twenty-two thousand, two hundred twenty".