11111011220 has 24 divisors (see below), whose sum is σ = 23412771144. Its totient is φ = 4429233536.

The previous prime is 11111011207. The next prime is 11111011243. The reversal of 11111011220 is 2211011111.

It can be written as a sum of positive squares in 4 ways, for example, as 2842382596 + 8268628624 = 53314^2 + 90932^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 942179 + ... + 953898.

It is an arithmetic number, because the mean of its divisors is an integer number (975532131).

Almost surely, 2^11111011220 is an apocalyptic number.

11111011220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11111011220 is an abundant number, since it is smaller than the sum of its proper divisors (12301759924).

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

11111011220 is a wasteful number, since it uses less digits than its factorization.

11111011220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1896379 (or 1896377 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 11111011220 its reverse (2211011111), we get a palindrome (13322022331).

The spelling of 11111011220 in words is "eleven billion, one hundred eleven million, eleven thousand, two hundred twenty".