21323300213 has 4 divisors (see below), whose sum is σ = 21843380748. Its totient is φ = 20803219680.

The previous prime is 21323300197. The next prime is 21323300237. The reversal of 21323300213 is 31200332312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12707376529 + 8615923684 = 112727^2 + 92822^2 .

It is a cyclic number.

It is not a de Polignac number, because 21323300213 - 2⁴ = 21323300197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21323380213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 260040206 + ... + 260040287.

It is an arithmetic number, because the mean of its divisors is an integer number (5460845187).

Almost surely, 2^21323300213 is an apocalyptic number.

It is an amenable number.

21323300213 is a deficient number, since it is larger than the sum of its proper divisors (520080535).

21323300213 is an equidigital number, since it uses as much as digits as its factorization.

21323300213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520080534.

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 21323300213 its reverse (31200332312), we get a palindrome (52523632525).

The spelling of 21323300213 in words is "twenty-one billion, three hundred twenty-three million, three hundred thousand, two hundred thirteen".