113221220 has 96 divisors (see below), whose sum is σ = 285465600. Its totient is φ = 36900864.

The previous prime is 113221217. The next prime is 113221253. The reversal of 113221220 is 22122311.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 113221195 and 113221204.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 320564 + ... + 320916.

It is an arithmetic number, because the mean of its divisors is an integer number (2973600).

Almost surely, 2^113221220 is an apocalyptic number.

113221220 is a gapful number since it is divisible by the number (10) 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 113221220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142732800).

113221220 is an abundant number, since it is smaller than the sum of its proper divisors (172244380).

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

113221220 is a wasteful number, since it uses less digits than its factorization.

113221220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 477 (or 475 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 113221220 is about 10640.5460386204. The cubic root of 113221220 is about 483.7740960206.

Adding to 113221220 its reverse (22122311), we get a palindrome (135343531).

The spelling of 113221220 in words is "one hundred thirteen million, two hundred twenty-one thousand, two hundred twenty".