1121100120 has 384 divisors, whose sum is σ = 4370595840. Its totient is φ = 243855360.

The previous prime is 1121100119. The next prime is 1121100133. The reversal of 1121100120 is 210011211.

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 an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 8827497 + ... + 8827623.

It is an arithmetic number, because the mean of its divisors is an integer number (11381760).

Almost surely, 2^1121100120 is an apocalyptic number.

1121100120 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 1121100120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2185297920).

1121100120 is an abundant number, since it is smaller than the sum of its proper divisors (3249495720).

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

1121100120 is a wasteful number, since it uses less digits than its factorization.

1121100120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295 (or 288 counting only the distinct ones).

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

The square root of 1121100120 is about 33482.8332134543. The cubic root of 1121100120 is about 1038.8387309242.

Adding to 1121100120 its reverse (210011211), we get a palindrome (1331111331).

The spelling of 1121100120 in words is "one billion, one hundred twenty-one million, one hundred thousand, one hundred twenty".