1101021120 has 336 divisors, whose sum is σ = 4110959520. Its totient is φ = 277364736.

The previous prime is 1101021091. The next prime is 1101021127. The reversal of 1101021120 is 211201011.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1101021127) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3118864 + ... + 3119216.

Almost surely, 2^1101021120 is an apocalyptic number.

1101021120 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 1101021120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2055479760).

1101021120 is an abundant number, since it is smaller than the sum of its proper divisors (3009938400).

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

1101021120 is a wasteful number, since it uses less digits than its factorization.

1101021120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417 (or 382 counting only the distinct ones).

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

The square root of 1101021120 is about 33181.6382959009. The cubic root of 1101021120 is about 1032.5994354184.

Adding to 1101021120 its reverse (211201011), we get a palindrome (1312222131).

The spelling of 1101021120 in words is "one billion, one hundred one million, twenty-one thousand, one hundred twenty".