1122011220 has 144 divisors (see below), whose sum is σ = 3656729664. Its totient is φ = 255974400.

The previous prime is 1122011129. The next prime is 1122011243. The reversal of 1122011220 is 221102211.

1122011220 = T₆₃₆₀ + T₆₃₆₁ + ... + T₆₄₁₄.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 1122011196 and 1122011205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 118875 + ... + 127965.

It is an arithmetic number, because the mean of its divisors is an integer number (25393956).

Almost surely, 2^1122011220 is an apocalyptic number.

1122011220 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 1122011220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1828364832).

1122011220 is an abundant number, since it is smaller than the sum of its proper divisors (2534718444).

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

1122011220 is a wasteful number, since it uses less digits than its factorization.

1122011220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9142 (or 9129 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 1122011220 is about 33496.4359298120. The cubic root of 1122011220 is about 1039.1200705562.

Adding to 1122011220 its reverse (221102211), we get a palindrome (1343113431).

Subtracting from 1122011220 its reverse (221102211), we obtain a palindrome (900909009).

The spelling of 1122011220 in words is "one billion, one hundred twenty-two million, eleven thousand, two hundred twenty".