1121100220 has 12 divisors (see below), whose sum is σ = 2354310504. Its totient is φ = 448440080.

The previous prime is 1121100193. The next prime is 1121100289. The reversal of 1121100220 is 220011211.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 1121100197 and 1121100206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28027486 + ... + 28027525.

It is an arithmetic number, because the mean of its divisors is an integer number (196192542).

Almost surely, 2^1121100220 is an apocalyptic number.

1121100220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1121100220 is an abundant number, since it is smaller than the sum of its proper divisors (1233210284).

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

1121100220 is a wasteful number, since it uses less digits than its factorization.

1121100220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56055020 (or 56055018 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 1121100220 is about 33482.8347067568. The cubic root of 1121100220 is about 1038.8387618117.

Adding to 1121100220 its reverse (220011211), we get a palindrome (1341111431).

The spelling of 1121100220 in words is "one billion, one hundred twenty-one million, one hundred thousand, two hundred twenty".