12111020020 has 48 divisors (see below), whose sum is σ = 28701993600. Its totient is φ = 4252142720.

The previous prime is 12111020017. The next prime is 12111020041. The reversal of 12111020020 is 2002011121.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 12111019979 and 12111020006.

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, 942760 + ... + 955519.

It is an arithmetic number, because the mean of its divisors is an integer number (597958200).

Almost surely, 2^12111020020 is an apocalyptic number.

12111020020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12111020020 is an abundant number, since it is smaller than the sum of its proper divisors (16590973580).

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

12111020020 is a wasteful number, since it uses less digits than its factorization.

12111020020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1898328 (or 1898326 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 12111020020 its reverse (2002011121), we get a palindrome (14113031141).

The spelling of 12111020020 in words is "twelve billion, one hundred eleven million, twenty thousand, twenty".