21333301333221 has 4 divisors (see below), whose sum is σ = 28444401777632. Its totient is φ = 14222200888812.

The previous prime is 21333301333151. The next prime is 21333301333237. The reversal of 21333301333221 is 12233310333312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21333301333221 - 2¹⁵ = 21333301300453 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 (21333301333241) 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 3 ways as a sum of consecutive naturals, for example, 3555550222201 + ... + 3555550222206.

It is an arithmetic number, because the mean of its divisors is an integer number (7111100444408).

Almost surely, 2^{21333301333221} is an apocalyptic number.

It is an amenable number.

21333301333221 is a deficient number, since it is larger than the sum of its proper divisors (7111100444411).

21333301333221 is an equidigital number, since it uses as much as digits as its factorization.

21333301333221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7111100444410.

The product of its (nonzero) digits is 17496, while the sum is 30.

Adding to 21333301333221 its reverse (12233310333312), we get a palindrome (33566611666533).

Subtracting from 21333301333221 its reverse (12233310333312), we obtain a palindrome (9099990999909).

The spelling of 21333301333221 in words is "twenty-one trillion, three hundred thirty-three billion, three hundred one million, three hundred thirty-three thousand, two hundred twenty-one".