12021022122020 has 72 divisors (see below), whose sum is σ = 26487546818040. Its totient is φ = 4582248563200.

The previous prime is 12021022121993. The next prime is 12021022122029. The reversal of 12021022122020 is 2022122012021.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 356010315556 + 11665011806464 = 596666^2 + 3415408^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 12021022122020.

It is not an unprimeable number, because it can be changed into a prime (12021022122029) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 734120 + ... + 4957920.

It is an arithmetic number, because the mean of its divisors is an integer number (367882594695).

Almost surely, 2^{12021022122020} is an apocalyptic number.

12021022122020 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 12021022122020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13243773409020).

12021022122020 is an abundant number, since it is smaller than the sum of its proper divisors (14466524696020).

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

12021022122020 is a wasteful number, since it uses less digits than its factorization.

12021022122020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4224125 (or 4224100 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 12021022122020 its reverse (2022122012021), we get a palindrome (14043144134041).

The spelling of 12021022122020 in words is "twelve trillion, twenty-one billion, twenty-two million, one hundred twenty-two thousand, twenty".