21131011320303 has 4 divisors (see below), whose sum is σ = 28174681760408. Its totient is φ = 14087340880200.

The previous prime is 21131011320277. The next prime is 21131011320311. The reversal of 21131011320303 is 30302311013112.

It is a happy number.

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

It is not a de Polignac number, because 21131011320303 - 2¹⁸ = 21131011058159 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21131011320303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21131011322303) 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, 3521835220048 + ... + 3521835220053.

It is an arithmetic number, because the mean of its divisors is an integer number (7043670440102).

Almost surely, 2^{21131011320303} is an apocalyptic number.

21131011320303 is a deficient number, since it is larger than the sum of its proper divisors (7043670440105).

21131011320303 is an equidigital number, since it uses as much as digits as its factorization.

21131011320303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7043670440104.

The product of its (nonzero) digits is 324, while the sum is 21.

Adding to 21131011320303 its reverse (30302311013112), we get a palindrome (51433322333415).

The spelling of 21131011320303 in words is "twenty-one trillion, one hundred thirty-one billion, eleven million, three hundred twenty thousand, three hundred three".