111111120021220 has 48 divisors (see below), whose sum is σ = 257065727236416. Its totient is φ = 40004003600000.

The previous prime is 111111120021199. The next prime is 111111120021233. The reversal of 111111120021220 is 22120021111111.

It is a junction number, because it is equal to n+sod(n) for n = 111111120021194 and 111111120021203.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2500228006 + ... + 2500272445.

It is an arithmetic number, because the mean of its divisors is an integer number (5355535984092).

Almost surely, 2^{111111120021220} is an apocalyptic number.

111111120021220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111111120021220 is an abundant number, since it is smaller than the sum of its proper divisors (145954607215196).

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

111111120021220 is a wasteful number, since it uses less digits than its factorization.

111111120021220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5000500572 (or 5000500570 counting only the distinct ones).

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

Adding to 111111120021220 its reverse (22120021111111), we get a palindrome (133231141132331).

The spelling of 111111120021220 in words is "one hundred eleven trillion, one hundred eleven billion, one hundred twenty million, twenty-one thousand, two hundred twenty".