21323033213 has 8 divisors (see below), whose sum is σ = 21404566008. Its totient is φ = 21241590784.

The previous prime is 21323033197. The next prime is 21323033219. The reversal of 21323033213 is 31233032312.

It can be written as a sum of positive squares in 4 ways, for example, as 1284648964 + 20038384249 = 35842^2 + 141557^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21323033213 - 2⁴ = 21323033197 is a prime.

It is a super-2 number, since 2×21323033213² (a number of 21 digits) contains 22 as substring.

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 (21323033219) 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 in 7 ways as a sum of consecutive naturals, for example, 470645 + ... + 513957.

It is an arithmetic number, because the mean of its divisors is an integer number (2675570751).

Almost surely, 2^21323033213 is an apocalyptic number.

It is an amenable number.

21323033213 is a deficient number, since it is larger than the sum of its proper divisors (81532795).

21323033213 is a wasteful number, since it uses less digits than its factorization.

21323033213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45183.

The product of its (nonzero) digits is 1944, while the sum is 23.

Adding to 21323033213 its reverse (31233032312), we get a palindrome (52556065525).

Subtracting 21323033213 from its reverse (31233032312), we obtain a palindrome (9909999099).

The spelling of 21323033213 in words is "twenty-one billion, three hundred twenty-three million, thirty-three thousand, two hundred thirteen".