20013133302221 has 4 divisors (see below), whose sum is σ = 20016116336700. Its totient is φ = 20010150267744.

The previous prime is 20013133302199. The next prime is 20013133302233. The reversal of 20013133302221 is 12220333131002.

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 14189430136996 + 5823703165225 = 3766886^2 + 2413235^2 .

It is a cyclic number.

It is not a de Polignac number, because 20013133302221 - 2²⁶ = 20013066193357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20013133362221) 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, 1491507176 + ... + 1491520593.

It is an arithmetic number, because the mean of its divisors is an integer number (5004029084175).

Almost surely, 2^{20013133302221} is an apocalyptic number.

It is an amenable number.

20013133302221 is a deficient number, since it is larger than the sum of its proper divisors (2983034479).

20013133302221 is an equidigital number, since it uses as much as digits as its factorization.

20013133302221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2983034478.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 20013133302221 its reverse (12220333131002), we get a palindrome (32233466433223).

The spelling of 20013133302221 in words is "twenty trillion, thirteen billion, one hundred thirty-three million, three hundred two thousand, two hundred twenty-one".