11112221121020 has 48 divisors (see below), whose sum is σ = 24352879703040. Its totient is φ = 4251174751296.

The previous prime is 11112221121019. The next prime is 11112221121041. The reversal of 11112221121020 is 2012112221111.

It is a super-3 number, since 3×11112221121020³ (a number of 40 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 11112221121020.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2993021 + ... + 5584139.

It is an arithmetic number, because the mean of its divisors is an integer number (507351660480).

Almost surely, 2^{11112221121020} is an apocalyptic number.

11112221121020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11112221121020 is an abundant number, since it is smaller than the sum of its proper divisors (13240658582020).

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

11112221121020 is a wasteful number, since it uses less digits than its factorization.

11112221121020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2600474 (or 2600472 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 11112221121020 its reverse (2012112221111), we get a palindrome (13124333342131).

The spelling of 11112221121020 in words is "eleven trillion, one hundred twelve billion, two hundred twenty-one million, one hundred twenty-one thousand, twenty".