1222203312 has 120 divisors (see below), whose sum is σ = 3779043840. Its totient is φ = 365639040.

The previous prime is 1222203251. The next prime is 1222203341. The reversal of 1222203312 is 2133022221.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 120253 + ... + 130019.

It is an arithmetic number, because the mean of its divisors is an integer number (31492032).

Almost surely, 2^1222203312 is an apocalyptic number.

1222203312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1222203312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1889521920).

1222203312 is an abundant number, since it is smaller than the sum of its proper divisors (2556840528).

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

1222203312 is a wasteful number, since it uses less digits than its factorization.

1222203312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9871 (or 9862 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 1222203312 is about 34960.0244851173. The cubic root of 1222203312 is about 1069.1725958623.

Adding to 1222203312 its reverse (2133022221), we get a palindrome (3355225533).

The spelling of 1222203312 in words is "one billion, two hundred twenty-two million, two hundred three thousand, three hundred twelve".