13440643221 has 16 divisors (see below), whose sum is σ = 17978433536. Its totient is φ = 8931683376.

The previous prime is 13440643219. The next prime is 13440643277. The reversal of 13440643221 is 12234604431.

13440643221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13440643221 - 2¹ = 13440643219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13440643121) 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 15 ways as a sum of consecutive naturals, for example, 1471956 + ... + 1481058.

It is an arithmetic number, because the mean of its divisors is an integer number (1123652096).

Almost surely, 2^13440643221 is an apocalyptic number.

It is an amenable number.

13440643221 is a deficient number, since it is larger than the sum of its proper divisors (4537790315).

13440643221 is a wasteful number, since it uses less digits than its factorization.

13440643221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10632.

The product of its (nonzero) digits is 13824, while the sum is 30.

The spelling of 13440643221 in words is "thirteen billion, four hundred forty million, six hundred forty-three thousand, two hundred twenty-one".