12001000201020 has 144 divisors (see below), whose sum is σ = 36500731176000. Its totient is φ = 3191681719296.

The previous prime is 12001000201019. The next prime is 12001000201027. The reversal of 12001000201020 is 2010200010021.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 12001000200993 and 12001000201011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12001000201027) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 352549161 + ... + 352583199.

Almost surely, 2^{12001000201020} is an apocalyptic number.

12001000201020 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 12001000201020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18250365588000).

12001000201020 is an abundant number, since it is smaller than the sum of its proper divisors (24499730974980).

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

12001000201020 is a wasteful number, since it uses less digits than its factorization.

12001000201020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39252 (or 39247 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 12001000201020 its reverse (2010200010021), we get a palindrome (14011200211041).

The spelling of 12001000201020 in words is "twelve trillion, one billion, two hundred one thousand, twenty".