13440044421 has 16 divisors (see below), whose sum is σ = 20959134400. Its totient is φ = 8488448784.

The previous prime is 13440044419. The next prime is 13440044441. The reversal of 13440044421 is 12444004431.

It is not a de Polignac number, because 13440044421 - 2¹ = 13440044419 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13440044441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13098946 + ... + 13099971.

It is an arithmetic number, because the mean of its divisors is an integer number (1309945900).

Almost surely, 2^13440044421 is an apocalyptic number.

It is an amenable number.

13440044421 is a deficient number, since it is larger than the sum of its proper divisors (7519089979).

13440044421 is a wasteful number, since it uses less digits than its factorization.

13440044421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26198945 (or 26198939 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

Adding to 13440044421 its reverse (12444004431), we get a palindrome (25884048852).

The spelling of 13440044421 in words is "thirteen billion, four hundred forty million, forty-four thousand, four hundred twenty-one".