12111111220020 has 48 divisors (see below), whose sum is σ = 35905882678848. Its totient is φ = 3039651443200.

The previous prime is 12111111219973. The next prime is 12111111220031. The reversal of 12111111220020 is 2002211111121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

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, 5936818206 + ... + 5936820245.

It is an arithmetic number, because the mean of its divisors is an integer number (748039222476).

Almost surely, 2^{12111111220020} is an apocalyptic number.

12111111220020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12111111220020 is an abundant number, since it is smaller than the sum of its proper divisors (23794771458828).

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

12111111220020 is a wasteful number, since it uses less digits than its factorization.

12111111220020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11873638480 (or 11873638478 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 12111111220020 its reverse (2002211111121), we get a palindrome (14113322331141).

The spelling of 12111111220020 in words is "twelve trillion, one hundred eleven billion, one hundred eleven million, two hundred twenty thousand, twenty".