21002303323 has 2 divisors, whose sum is σ = 21002303324. Its totient is φ = 21002303322.

The previous prime is 21002303321. The next prime is 21002303347. The reversal of 21002303323 is 32330320012.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21002303323 - 2¹ = 21002303321 is a prime.

Together with 21002303321, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21002303323.

It is not a weakly prime, because it can be changed into another prime (21002303321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501151661 + 10501151662.

It is an arithmetic number, because the mean of its divisors is an integer number (10501151662).

Almost surely, 2^21002303323 is an apocalyptic number.

21002303323 is a deficient number, since it is larger than the sum of its proper divisors (1).

21002303323 is an equidigital number, since it uses as much as digits as its factorization.

21002303323 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 19.

Adding to 21002303323 its reverse (32330320012), we get a palindrome (53332623335).

The spelling of 21002303323 in words is "twenty-one billion, two million, three hundred three thousand, three hundred twenty-three".