1011011220 has 144 divisors (see below), whose sum is σ = 3196048128. Its totient is φ = 268272000.

The previous prime is 1011011189. The next prime is 1011011231. The reversal of 1011011220 is 221101101.

It is a happy number.

1011011220 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

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

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, 1345845 + ... + 1346595.

Almost surely, 2^1011011220 is an apocalyptic number.

1011011220 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 1011011220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1598024064).

1011011220 is an abundant number, since it is smaller than the sum of its proper divisors (2185036908).

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

1011011220 is a wasteful number, since it uses less digits than its factorization.

1011011220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1052 (or 1038 counting only the distinct ones).

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

The square root of 1011011220 is about 31796.4026267123. The cubic root of 1011011220 is about 1003.6570165936.

Adding to 1011011220 its reverse (221101101), we get a palindrome (1232112321).

The spelling of 1011011220 in words is "one billion, eleven million, eleven thousand, two hundred twenty".