21323012303 has 2 divisors, whose sum is σ = 21323012304. Its totient is φ = 21323012302.

The previous prime is 21323012287. The next prime is 21323012357. The reversal of 21323012303 is 30321032312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21323012303 - 2⁴ = 21323012287 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21323012383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10661506151 + 10661506152.

It is an arithmetic number, because the mean of its divisors is an integer number (10661506152).

Almost surely, 2^21323012303 is an apocalyptic number.

21323012303 is a deficient number, since it is larger than the sum of its proper divisors (1).

21323012303 is an equidigital number, since it uses as much as digits as its factorization.

21323012303 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 20.

Adding to 21323012303 its reverse (30321032312), we get a palindrome (51644044615).

The spelling of 21323012303 in words is "twenty-one billion, three hundred twenty-three million, twelve thousand, three hundred three".