13067021621 has 2 divisors, whose sum is σ = 13067021622. Its totient is φ = 13067021620.

The previous prime is 13067021557. The next prime is 13067021629. The reversal of 13067021621 is 12612076031.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13067004721 + 16900 = 114311^2 + 130^2 .

It is an emirp because it is prime and its reverse (12612076031) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13067021621 - 2⁶ = 13067021557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13067021629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6533510810 + 6533510811.

It is an arithmetic number, because the mean of its divisors is an integer number (6533510811).

Almost surely, 2^13067021621 is an apocalyptic number.

It is an amenable number.

13067021621 is a deficient number, since it is larger than the sum of its proper divisors (1).

13067021621 is an equidigital number, since it uses as much as digits as its factorization.

13067021621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 29.

Adding to 13067021621 its reverse (12612076031), we get a palindrome (25679097652).

The spelling of 13067021621 in words is "thirteen billion, sixty-seven million, twenty-one thousand, six hundred twenty-one".