21432330313 has 4 divisors (see below), whose sum is σ = 21432761028. Its totient is φ = 21431899600.

The previous prime is 21432330299. The next prime is 21432330329. The reversal of 21432330313 is 31303323412.

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 10074739129 + 11357591184 = 100373^2 + 106572^2 .

It is a cyclic number.

It is not a de Polignac number, because 21432330313 - 2¹⁷ = 21432199241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21432330113) 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, 129238 + ... + 244063.

It is an arithmetic number, because the mean of its divisors is an integer number (5358190257).

Almost surely, 2^21432330313 is an apocalyptic number.

It is an amenable number.

21432330313 is a deficient number, since it is larger than the sum of its proper divisors (430715).

21432330313 is an equidigital number, since it uses as much as digits as its factorization.

21432330313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430714.

The product of its (nonzero) digits is 3888, while the sum is 25.

Adding to 21432330313 its reverse (31303323412), we get a palindrome (52735653725).

The spelling of 21432330313 in words is "twenty-one billion, four hundred thirty-two million, three hundred thirty thousand, three hundred thirteen".