21330021313 has 4 divisors (see below), whose sum is σ = 22257413568. Its totient is φ = 20402629060.

The previous prime is 21330021311. The next prime is 21330021337. The reversal of 21330021313 is 31312003312.

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 cyclic number.

It is not a de Polignac number, because 21330021313 - 2¹ = 21330021311 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21330021311) 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, 463696093 + ... + 463696138.

It is an arithmetic number, because the mean of its divisors is an integer number (5564353392).

Almost surely, 2^21330021313 is an apocalyptic number.

21330021313 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21330021313 is a deficient number, since it is larger than the sum of its proper divisors (927392255).

21330021313 is an equidigital number, since it uses as much as digits as its factorization.

21330021313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 927392254.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 21330021313 its reverse (31312003312), we get a palindrome (52642024625).

The spelling of 21330021313 in words is "twenty-one billion, three hundred thirty million, twenty-one thousand, three hundred thirteen".