21131310320303 has 4 divisors (see below), whose sum is σ = 21133088014560. Its totient is φ = 21129532626048.

The previous prime is 21131310320287. The next prime is 21131310320359. The reversal of 21131310320303 is 30302301313112.

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 21131310320303 - 2⁴ = 21131310320287 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 (21131310320903) 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, 888829298 + ... + 888853071.

It is an arithmetic number, because the mean of its divisors is an integer number (5283272003640).

Almost surely, 2^{21131310320303} is an apocalyptic number.

21131310320303 is a deficient number, since it is larger than the sum of its proper divisors (1777694257).

21131310320303 is a wasteful number, since it uses less digits than its factorization.

21131310320303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1777694256.

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

Adding to 21131310320303 its reverse (30302301313112), we get a palindrome (51433611633415).

The spelling of 21131310320303 in words is "twenty-one trillion, one hundred thirty-one billion, three hundred ten million, three hundred twenty thousand, three hundred three".