13221679 has 2 divisors, whose sum is σ = 13221680. Its totient is φ = 13221678.

The previous prime is 13221673. The next prime is 13221697. The reversal of 13221679 is 97612231.

Together with next prime (13221697) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13221679 - 2³ = 13221671 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13221679.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13221671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6610839 + 6610840.

It is an arithmetic number, because the mean of its divisors is an integer number (6610840).

Almost surely, 2^13221679 is an apocalyptic number.

13221679 is a deficient number, since it is larger than the sum of its proper divisors (1).

13221679 is an equidigital number, since it uses as much as digits as its factorization.

13221679 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4536, while the sum is 31.

The square root of 13221679 is about 3636.1626751288. The cubic root of 13221679 is about 236.4624597924.

The spelling of 13221679 in words is "thirteen million, two hundred twenty-one thousand, six hundred seventy-nine".