12021021112020 has 96 divisors (see below), whose sum is σ = 34847172259200. Its totient is φ = 3092608587264.

The previous prime is 12021021111971. The next prime is 12021021112027. The reversal of 12021021112020 is 2021112012021.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021021112027) 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, 553039 + ... + 4934358.

It is an arithmetic number, because the mean of its divisors is an integer number (362991377700).

Almost surely, 2^{12021021112020} is an apocalyptic number.

12021021112020 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 12021021112020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17423586129600).

12021021112020 is an abundant number, since it is smaller than the sum of its proper divisors (22826151147180).

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

12021021112020 is a wasteful number, since it uses less digits than its factorization.

12021021112020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5488697 (or 5488695 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 12021021112020 its reverse (2021112012021), we get a palindrome (14042133124041).

Subtracting from 12021021112020 its reverse (2021112012021), we obtain a palindrome (9999909099999).

The spelling of 12021021112020 in words is "twelve trillion, twenty-one billion, twenty-one million, one hundred twelve thousand, twenty".