21403310023 has 2 divisors, whose sum is σ = 21403310024. Its totient is φ = 21403310022.

The previous prime is 21403310021. The next prime is 21403310051. The reversal of 21403310023 is 32001330412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21403310023 - 2¹ = 21403310021 is a prime.

Together with 21403310021, 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 (21403310021) 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, 10701655011 + 10701655012.

It is an arithmetic number, because the mean of its divisors is an integer number (10701655012).

Almost surely, 2^21403310023 is an apocalyptic number.

21403310023 is a deficient number, since it is larger than the sum of its proper divisors (1).

21403310023 is an equidigital number, since it uses as much as digits as its factorization.

21403310023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21403310023 its reverse (32001330412), we get a palindrome (53404640435).

The spelling of 21403310023 in words is "twenty-one billion, four hundred three million, three hundred ten thousand, twenty-three".