12021113311021 has 24 divisors (see below), whose sum is σ = 12872381794344. Its totient is φ = 11223464017920.

The previous prime is 12021113311001. The next prime is 12021113311043. The reversal of 12021113311021 is 12011331112021.

It can be written as a sum of positive squares in 12 ways, for example, as 277565654025 + 11743547656996 = 526845^2 + 3426886^2 .

It is a de Polignac number, because none of the positive numbers 2^k-12021113311021 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12021113311021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021113311001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19384011 + ... + 19994551.

It is an arithmetic number, because the mean of its divisors is an integer number (536349241431).

Almost surely, 2^{12021113311021} is an apocalyptic number.

It is an amenable number.

12021113311021 is a deficient number, since it is larger than the sum of its proper divisors (851268483323).

12021113311021 is a wasteful number, since it uses less digits than its factorization.

12021113311021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 611121 (or 611104 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 12021113311021 its reverse (12011331112021), we get a palindrome (24032444423042).

The spelling of 12021113311021 in words is "twelve trillion, twenty-one billion, one hundred thirteen million, three hundred eleven thousand, twenty-one".