13221206639 has 4 divisors (see below), whose sum is σ = 13917059640. Its totient is φ = 12525353640.

The previous prime is 13221206597. The next prime is 13221206641. The reversal of 13221206639 is 93660212231.

13221206639 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93660212231 = 47 ⋅1992770473.

It is a cyclic number.

It is not a de Polignac number, because 13221206639 - 2¹⁶ = 13221141103 is a prime.

It is a super-2 number, since 2×13221206639² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13221206599 and 13221206608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13221206659) 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 in 3 ways as a sum of consecutive naturals, for example, 347926472 + ... + 347926509.

It is an arithmetic number, because the mean of its divisors is an integer number (3479264910).

Almost surely, 2^13221206639 is an apocalyptic number.

13221206639 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

13221206639 is a deficient number, since it is larger than the sum of its proper divisors (695853001).

13221206639 is an equidigital number, since it uses as much as digits as its factorization.

13221206639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 695853000.

The product of its (nonzero) digits is 23328, while the sum is 35.

The spelling of 13221206639 in words is "thirteen billion, two hundred twenty-one million, two hundred six thousand, six hundred thirty-nine".