1091220120 has 128 divisors (see below), whose sum is σ = 3762936000. Its totient is φ = 280949760.

The previous prime is 1091220107. The next prime is 1091220131. The reversal of 1091220120 is 210221901.

It is a super-2 number, since 2×1091220120² = 2381522700585628800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1091220093 and 1091220102.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13900 + ... + 48740.

Almost surely, 2^1091220120 is an apocalyptic number.

1091220120 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 1091220120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1881468000).

1091220120 is an abundant number, since it is smaller than the sum of its proper divisors (2671715880).

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

1091220120 is a wasteful number, since it uses less digits than its factorization.

1091220120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34890 (or 34880 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 1091220120 is about 33033.6210549192. The cubic root of 1091220120 is about 1029.5263225569.

The spelling of 1091220120 in words is "one billion, ninety-one million, two hundred twenty thousand, one hundred twenty".