21331231100303 has 4 divisors (see below), whose sum is σ = 21588233884728. Its totient is φ = 21074228315880.

The previous prime is 21331231100233. The next prime is 21331231100359. The reversal of 21331231100303 is 30300113213312.

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

It is a cyclic number.

It is not a de Polignac number, because 21331231100303 - 2³⁶ = 21262511623567 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 (21331231600303) 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, 128501392088 + ... + 128501392253.

It is an arithmetic number, because the mean of its divisors is an integer number (5397058471182).

Almost surely, 2^{21331231100303} is an apocalyptic number.

21331231100303 is a deficient number, since it is larger than the sum of its proper divisors (257002784425).

21331231100303 is an equidigital number, since it uses as much as digits as its factorization.

21331231100303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257002784424.

The product of its (nonzero) digits is 972, while the sum is 23.

Adding to 21331231100303 its reverse (30300113213312), we get a palindrome (51631344313615).

The spelling of 21331231100303 in words is "twenty-one trillion, three hundred thirty-one billion, two hundred thirty-one million, one hundred thousand, three hundred three".