111211012220020 has 24 divisors (see below), whose sum is σ = 235685723149800. Its totient is φ = 44076291080832.

The previous prime is 111211012219997. The next prime is 111211012220027. The reversal of 111211012220020 is 20022210112111.

It can be written as a sum of positive squares in 4 ways, for example, as 46974409948944 + 64236602271076 = 6853788^2 + 8014774^2 .

It is a junction number, because it is equal to n+sod(n) for n = 111211012219976 and 111211012220003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111211012220027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25507110715 + ... + 25507115074.

It is an arithmetic number, because the mean of its divisors is an integer number (9820238464575).

Almost surely, 2^{111211012220020} is an apocalyptic number.

111211012220020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111211012220020 is an abundant number, since it is smaller than the sum of its proper divisors (124474710929780).

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

111211012220020 is a wasteful number, since it uses less digits than its factorization.

111211012220020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51014225907 (or 51014225905 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 111211012220020 its reverse (20022210112111), we get a palindrome (131233222332131).

The spelling of 111211012220020 in words is "one hundred eleven trillion, two hundred eleven billion, twelve million, two hundred twenty thousand, twenty".