13330031621 has 2 divisors, whose sum is σ = 13330031622. Its totient is φ = 13330031620.

The previous prime is 13330031599. The next prime is 13330031623. The reversal of 13330031621 is 12613003331.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12821032900 + 508998721 = 113230^2 + 22561^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13330031621 is a prime.

Together with 13330031623, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13330031623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6665015810 + 6665015811.

It is an arithmetic number, because the mean of its divisors is an integer number (6665015811).

Almost surely, 2^13330031621 is an apocalyptic number.

It is an amenable number.

13330031621 is a deficient number, since it is larger than the sum of its proper divisors (1).

13330031621 is an equidigital number, since it uses as much as digits as its factorization.

13330031621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 23.

Adding to 13330031621 its reverse (12613003331), we get a palindrome (25943034952).

The spelling of 13330031621 in words is "thirteen billion, three hundred thirty million, thirty-one thousand, six hundred twenty-one".