13221020693 has 2 divisors, whose sum is σ = 13221020694. Its totient is φ = 13221020692.

The previous prime is 13221020651. The next prime is 13221020719. The reversal of 13221020693 is 39602012231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13184321329 + 36699364 = 114823^2 + 6058^2 .

It is a cyclic number.

It is not a de Polignac number, because 13221020693 - 2³² = 8926053397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13221023693) 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, 6610510346 + 6610510347.

It is an arithmetic number, because the mean of its divisors is an integer number (6610510347).

Almost surely, 2^13221020693 is an apocalyptic number.

It is an amenable number.

13221020693 is a deficient number, since it is larger than the sum of its proper divisors (1).

13221020693 is an equidigital number, since it uses as much as digits as its factorization.

13221020693 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 29.

The spelling of 13221020693 in words is "thirteen billion, two hundred twenty-one million, twenty thousand, six hundred ninety-three".