1122122220 has 24 divisors (see below), whose sum is σ = 3141942384. Its totient is φ = 299232576.

The previous prime is 1122122207. The next prime is 1122122263. The reversal of 1122122220 is 222212211.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1122122220.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9350959 + ... + 9351078.

It is an arithmetic number, because the mean of its divisors is an integer number (130914266).

Almost surely, 2^1122122220 is an apocalyptic number.

1122122220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1122122220 is an abundant number, since it is smaller than the sum of its proper divisors (2019820164).

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

1122122220 is a wasteful number, since it uses less digits than its factorization.

1122122220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18702049 (or 18702047 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 1122122220 is about 33498.0927815301. The cubic root of 1122122220 is about 1039.1543359665.

Adding to 1122122220 its reverse (222212211), we get a palindrome (1344334431).

The spelling of 1122122220 in words is "one billion, one hundred twenty-two million, one hundred twenty-two thousand, two hundred twenty".