21333103035421 has 4 divisors (see below), whose sum is σ = 21394229405500. Its totient is φ = 21271976665344.

The previous prime is 21333103035407. The next prime is 21333103035427. The reversal of 21333103035421 is 12453030133312.

It is a happy number.

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 18441776883321 + 2891326152100 = 4294389^2 + 1700390^2 .

It is a cyclic number.

It is not a de Polignac number, because 21333103035421 - 2²³ = 21333094646813 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 (21333103035427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30563184516 + ... + 30563185213.

It is an arithmetic number, because the mean of its divisors is an integer number (5348557351375).

Almost surely, 2^{21333103035421} is an apocalyptic number.

It is an amenable number.

21333103035421 is a deficient number, since it is larger than the sum of its proper divisors (61126370079).

21333103035421 is an equidigital number, since it uses as much as digits as its factorization.

21333103035421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61126370078.

The product of its (nonzero) digits is 19440, while the sum is 31.

Adding to 21333103035421 its reverse (12453030133312), we get a palindrome (33786133168733).

The spelling of 21333103035421 in words is "twenty-one trillion, three hundred thirty-three billion, one hundred three million, thirty-five thousand, four hundred twenty-one".