1220111144 has 128 divisors (see below), whose sum is σ = 2886451200. Its totient is φ = 471744000.

The previous prime is 1220111143. The next prime is 1220111159. The reversal of 1220111144 is 4411110221.

It is not an unprimeable number, because it can be changed into a prime (1220111141) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2341604 + ... + 2342124.

It is an arithmetic number, because the mean of its divisors is an integer number (22550400).

Almost surely, 2^1220111144 is an apocalyptic number.

1220111144 is a gapful number since it is divisible by the number (14) 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 1220111144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1443225600).

1220111144 is an abundant number, since it is smaller than the sum of its proper divisors (1666340056).

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

1220111144 is a wasteful number, since it uses less digits than its factorization.

1220111144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655 (or 651 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

The square root of 1220111144 is about 34930.0893786432. The cubic root of 1220111144 is about 1068.5621774336.

Adding to 1220111144 its reverse (4411110221), we get a palindrome (5631221365).

The spelling of 1220111144 in words is "one billion, two hundred twenty million, one hundred eleven thousand, one hundred forty-four".