21323010013 has 2 divisors, whose sum is σ = 21323010014. Its totient is φ = 21323010012.

The previous prime is 21323009999. The next prime is 21323010043. The reversal of 21323010013 is 31001032312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15759789444 + 5563220569 = 125538^2 + 74587^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21323010013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21323010043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10661505006 + 10661505007.

It is an arithmetic number, because the mean of its divisors is an integer number (10661505007).

Almost surely, 2^21323010013 is an apocalyptic number.

It is an amenable number.

21323010013 is a deficient number, since it is larger than the sum of its proper divisors (1).

21323010013 is an equidigital number, since it uses as much as digits as its factorization.

21323010013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21323010013 its reverse (31001032312), we get a palindrome (52324042325).

The spelling of 21323010013 in words is "twenty-one billion, three hundred twenty-three million, ten thousand, thirteen".