13211221643 has 8 divisors (see below), whose sum is σ = 14260989600. Its totient is φ = 12201067648.

The previous prime is 13211221637. The next prime is 13211221651. The reversal of 13211221643 is 34612211231.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13211221643 - 2⁶ = 13211221579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13211221613) 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 in 7 ways as a sum of consecutive naturals, for example, 9902798 + ... + 9904131.

It is an arithmetic number, because the mean of its divisors is an integer number (1782623700).

Almost surely, 2^13211221643 is an apocalyptic number.

13211221643 is a deficient number, since it is larger than the sum of its proper divisors (1049767957).

13211221643 is a wasteful number, since it uses less digits than its factorization.

13211221643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19806981.

The product of its digits is 1728, while the sum is 26.

Adding to 13211221643 its reverse (34612211231), we get a palindrome (47823432874).

The spelling of 13211221643 in words is "thirteen billion, two hundred eleven million, two hundred twenty-one thousand, six hundred forty-three".