1111020120 has 144 divisors (see below), whose sum is σ = 4200402960. Its totient is φ = 253943424.

The previous prime is 1111020103. The next prime is 1111020121. The reversal of 1111020120 is 210201111.

It is a happy number.

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

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111020121) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 13852 + ... + 49131.

It is an arithmetic number, because the mean of its divisors is an integer number (29169465).

Almost surely, 2^1111020120 is an apocalyptic number.

1111020120 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 1111020120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2100201480).

1111020120 is an abundant number, since it is smaller than the sum of its proper divisors (3089382840).

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

1111020120 is a wasteful number, since it uses less digits than its factorization.

1111020120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63014 (or 63000 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 1111020120 is about 33331.9684387226. The cubic root of 1111020120 is about 1035.7158948257.

Adding to 1111020120 its reverse (210201111), we get a palindrome (1321221231).

The spelling of 1111020120 in words is "one billion, one hundred eleven million, twenty thousand, one hundred twenty".