21323013001 has 2 divisors, whose sum is σ = 21323013002. Its totient is φ = 21323013000.

The previous prime is 21323012987. The next prime is 21323013097. The reversal of 21323013001 is 10031032312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21301110601 + 21902400 = 145949^2 + 4680^2 .

It is a cyclic number.

It is not a de Polignac number, because 21323013001 - 2⁹ = 21323012489 is a prime.

It is not a weakly prime, because it can be changed into another prime (21323113001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10661506500 + 10661506501.

It is an arithmetic number, because the mean of its divisors is an integer number (10661506501).

Almost surely, 2^21323013001 is an apocalyptic number.

It is an amenable number.

21323013001 is a deficient number, since it is larger than the sum of its proper divisors (1).

21323013001 is an equidigital number, since it uses as much as digits as its factorization.

21323013001 is an odious number, because the sum of its binary digits is odd.

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

Adding to 21323013001 its reverse (10031032312), we get a palindrome (31354045313).

The spelling of 21323013001 in words is "twenty-one billion, three hundred twenty-three million, thirteen thousand, one".