1011221118 has 32 divisors (see below), whose sum is σ = 2248197120. Its totient is φ = 336917880.

The previous prime is 1011221111. The next prime is 1011221129. The reversal of 1011221118 is 8111221101.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1011221118.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011221111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 225171 + ... + 229617.

It is an arithmetic number, because the mean of its divisors is an integer number (70256160).

Almost surely, 2^1011221118 is an apocalyptic number.

1011221118 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1011221118 is an abundant number, since it is smaller than the sum of its proper divisors (1236976002).

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

1011221118 is a wasteful number, since it uses less digits than its factorization.

1011221118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8669 (or 8663 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

The square root of 1011221118 is about 31799.7031118217. The cubic root of 1011221118 is about 1003.7264688473.

Adding to 1011221118 its reverse (8111221101), we get a palindrome (9122442219).

The spelling of 1011221118 in words is "one billion, eleven million, two hundred twenty-one thousand, one hundred eighteen".