12013331021221 has 4 divisors (see below), whose sum is σ = 12013366094092. Its totient is φ = 12013295948352.

The previous prime is 12013331021183. The next prime is 12013331021233. The reversal of 12013331021221 is 12212013331021.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4944459220996 + 7068871800225 = 2223614^2 + 2658735^2 .

It is a cyclic number.

It is not a de Polignac number, because 12013331021221 - 2⁷ = 12013331021093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12013331021192 and 12013331021201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12013331021291) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17017530 + ... + 17709403.

It is an arithmetic number, because the mean of its divisors is an integer number (3003341523523).

Almost surely, 2^{12013331021221} is an apocalyptic number.

It is an amenable number.

12013331021221 is a deficient number, since it is larger than the sum of its proper divisors (35072871).

12013331021221 is an equidigital number, since it uses as much as digits as its factorization.

12013331021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35072870.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 12013331021221 its reverse (12212013331021), we get a palindrome (24225344352242).

The spelling of 12013331021221 in words is "twelve trillion, thirteen billion, three hundred thirty-one million, twenty-one thousand, two hundred twenty-one".