1222255220 has 24 divisors (see below), whose sum is σ = 2626429344. Its totient is φ = 477531936.

The previous prime is 1222255219. The next prime is 1222255241. The reversal of 1222255220 is 225522221.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 709754 + ... + 711473.

It is an arithmetic number, because the mean of its divisors is an integer number (109434556).

Almost surely, 2^1222255220 is an apocalyptic number.

1222255220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1222255220 is an abundant number, since it is smaller than the sum of its proper divisors (1404174124).

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

1222255220 is a wasteful number, since it uses less digits than its factorization.

1222255220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1421279 (or 1421277 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 1222255220 is about 34960.7668680194. The cubic root of 1222255220 is about 1069.1877318670.

Adding to 1222255220 its reverse (225522221), we get a palindrome (1447777441).

The spelling of 1222255220 in words is "one billion, two hundred twenty-two million, two hundred fifty-five thousand, two hundred twenty".