21330032313 has 4 divisors (see below), whose sum is σ = 28440043088. Its totient is φ = 14220021540.

The previous prime is 21330032291. The next prime is 21330032323. The reversal of 21330032313 is 31323003312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-21330032313 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21330032313.

It is not an unprimeable number, because it can be changed into a prime (21330032323) 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 3 ways as a sum of consecutive naturals, for example, 3555005383 + ... + 3555005388.

It is an arithmetic number, because the mean of its divisors is an integer number (7110010772).

Almost surely, 2^21330032313 is an apocalyptic number.

It is an amenable number.

21330032313 is a deficient number, since it is larger than the sum of its proper divisors (7110010775).

21330032313 is an equidigital number, since it uses as much as digits as its factorization.

21330032313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7110010774.

The product of its (nonzero) digits is 972, while the sum is 21.

Adding to 21330032313 its reverse (31323003312), we get a palindrome (52653035625).

The spelling of 21330032313 in words is "twenty-one billion, three hundred thirty million, thirty-two thousand, three hundred thirteen".