21313321303 has 2 divisors, whose sum is σ = 21313321304. Its totient is φ = 21313321302.

The previous prime is 21313321259. The next prime is 21313321321. The reversal of 21313321303 is 30312331312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21313321303 - 2¹³ = 21313313111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21313321363) 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 as a sum of consecutive naturals, namely, 10656660651 + 10656660652.

It is an arithmetic number, because the mean of its divisors is an integer number (10656660652).

Almost surely, 2^21313321303 is an apocalyptic number.

21313321303 is a deficient number, since it is larger than the sum of its proper divisors (1).

21313321303 is an equidigital number, since it uses as much as digits as its factorization.

21313321303 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 22.

Adding to 21313321303 its reverse (30312331312), we get a palindrome (51625652615).

The spelling of 21313321303 in words is "twenty-one billion, three hundred thirteen million, three hundred twenty-one thousand, three hundred three".