13221209971 has 2 divisors, whose sum is σ = 13221209972. Its totient is φ = 13221209970.

The previous prime is 13221209921. The next prime is 13221209999. The reversal of 13221209971 is 17990212231.

13221209971 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13221209971 - 2¹³ = 13221201779 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13221209971.

It is not a weakly prime, because it can be changed into another prime (13221209921) 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 as a sum of consecutive naturals, namely, 6610604985 + 6610604986.

It is an arithmetic number, because the mean of its divisors is an integer number (6610604986).

Almost surely, 2^13221209971 is an apocalyptic number.

13221209971 is a deficient number, since it is larger than the sum of its proper divisors (1).

13221209971 is an equidigital number, since it uses as much as digits as its factorization.

13221209971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 37.

The spelling of 13221209971 in words is "thirteen billion, two hundred twenty-one million, two hundred nine thousand, nine hundred seventy-one".