1120001220 has 144 divisors (see below), whose sum is σ = 3744092352. Its totient is φ = 269256960.

The previous prime is 1120001209. The next prime is 1120001237. The reversal of 1120001220 is 221000211.

It is a Harshad number since it is a multiple of its sum of digits (9).

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 47 ways as a sum of consecutive naturals, for example, 95055 + ... + 106185.

Almost surely, 2^1120001220 is an apocalyptic number.

1120001220 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 1120001220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1872046176).

1120001220 is an abundant number, since it is smaller than the sum of its proper divisors (2624091132).

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

1120001220 is a wasteful number, since it uses less digits than its factorization.

1120001220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11202 (or 11197 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 1120001220 is about 33466.4192885944. The cubic root of 1120001220 is about 1038.4991974441.

Adding to 1120001220 its reverse (221000211), we get a palindrome (1341001431).

The spelling of 1120001220 in words is "one billion, one hundred twenty million, one thousand, two hundred twenty".