21310231303 has 2 divisors, whose sum is σ = 21310231304. Its totient is φ = 21310231302.

The previous prime is 21310231301. The next prime is 21310231333. The reversal of 21310231303 is 30313201312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21310231303 - 2¹ = 21310231301 is a prime.

It is a super-2 number, since 2×21310231303² (a number of 21 digits) contains 22 as substring.

Together with 21310231301, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21310231301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10655115651 + 10655115652.

It is an arithmetic number, because the mean of its divisors is an integer number (10655115652).

Almost surely, 2^21310231303 is an apocalyptic number.

21310231303 is a deficient number, since it is larger than the sum of its proper divisors (1).

21310231303 is an equidigital number, since it uses as much as digits as its factorization.

21310231303 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 21310231303 its reverse (30313201312), we get a palindrome (51623432615).

The spelling of 21310231303 in words is "twenty-one billion, three hundred ten million, two hundred thirty-one thousand, three hundred three".