21321330331013 has 4 divisors (see below), whose sum is σ = 21321508486080. Its totient is φ = 21321152175948.

The previous prime is 21321330330953. The next prime is 21321330331019. The reversal of 21321330331013 is 31013303312312.

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 21321330331013 - 2²⁸ = 21321061895557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21321330331019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88897895 + ... + 89137412.

It is an arithmetic number, because the mean of its divisors is an integer number (5330377121520).

Almost surely, 2^{21321330331013} is an apocalyptic number.

It is an amenable number.

21321330331013 is a deficient number, since it is larger than the sum of its proper divisors (178155067).

21321330331013 is a wasteful number, since it uses less digits than its factorization.

21321330331013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178155066.

The product of its (nonzero) digits is 2916, while the sum is 26.

Adding to 21321330331013 its reverse (31013303312312), we get a palindrome (52334633643325).

The spelling of 21321330331013 in words is "twenty-one trillion, three hundred twenty-one billion, three hundred thirty million, three hundred thirty-one thousand, thirteen".