1222112220 has 96 divisors (see below), whose sum is σ = 4016506368. Its totient is φ = 271786752.

The previous prime is 1222112219. The next prime is 1222112239. The reversal of 1222112220 is 222112221.

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 1222112220.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 23782 + ... + 54861.

It is an arithmetic number, because the mean of its divisors is an integer number (41838608).

Almost surely, 2^1222112220 is an apocalyptic number.

1222112220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1222112220 is an abundant number, since it is smaller than the sum of its proper divisors (2794394148).

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

1222112220 is a wasteful number, since it uses less digits than its factorization.

1222112220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78699 (or 78697 counting only the distinct ones).

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

The square root of 1222112220 is about 34958.7216585504. The cubic root of 1222112220 is about 1069.1460330450.

Adding to 1222112220 its reverse (222112221), we get a palindrome (1444224441).

Subtracting from 1222112220 its reverse (222112221), we obtain a palindrome (999999999).

The spelling of 1222112220 in words is "one billion, two hundred twenty-two million, one hundred twelve thousand, two hundred twenty".