111012021000020 has 144 divisors (see below), whose sum is σ = 273299077997568. Its totient is φ = 37765348185600.

The previous prime is 111012020999987. The next prime is 111012021000037. The reversal of 111012021000020 is 20000120210111.

It is a junction number, because it is equal to n+sod(n) for n = 111012020999965 and 111012021000010.

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, 127272104 + ... + 128141376.

It is an arithmetic number, because the mean of its divisors is an integer number (1897910263872).

Almost surely, 2^{111012021000020} is an apocalyptic number.

111012021000020 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 111012021000020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (136649538998784).

111012021000020 is an abundant number, since it is smaller than the sum of its proper divisors (162287056997548).

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

111012021000020 is a wasteful number, since it uses less digits than its factorization.

111012021000020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870310 (or 870301 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 111012021000020 its reverse (20000120210111), we get a palindrome (131012141210131).

The spelling of 111012021000020 in words is "one hundred eleven trillion, twelve billion, twenty-one million, twenty", and thus it is an aban number.