12002120020 has 96 divisors (see below), whose sum is σ = 29198848896. Its totient is φ = 4095590400.

The previous prime is 12002119979. The next prime is 12002120023. The reversal of 12002120020 is 2002120021.

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 = 12002119979 and 12002120006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12002120023) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1315675 + ... + 1324765.

It is an arithmetic number, because the mean of its divisors is an integer number (304154676).

Almost surely, 2^12002120020 is an apocalyptic number.

12002120020 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 12002120020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14599424448).

12002120020 is an abundant number, since it is smaller than the sum of its proper divisors (17196728876).

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

12002120020 is a wasteful number, since it uses less digits than its factorization.

12002120020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9481 (or 9479 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 12002120020 its reverse (2002120021), we get a palindrome (14004240041).

Subtracting from 12002120020 its reverse (2002120021), we obtain a palindrome (9999999999).

It can be divided in two parts, 120021 and 20020, that added together give a palindrome (140041).

The spelling of 12002120020 in words is "twelve billion, two million, one hundred twenty thousand, twenty".