440344221421 has 24 divisors (see below), whose sum is σ = 484505763840. Its totient is φ = 399973706496.

The previous prime is 440344221379. The next prime is 440344221439. The reversal of 440344221421 is 124122443044.

It is a happy number.

It is not a de Polignac number, because 440344221421 - 2¹¹ = 440344219373 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 (440344221451) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2571540 + ... + 2737426.

It is an arithmetic number, because the mean of its divisors is an integer number (20187740160).

Almost surely, 2^440344221421 is an apocalyptic number.

It is an amenable number.

440344221421 is a deficient number, since it is larger than the sum of its proper divisors (44161542419).

440344221421 is a wasteful number, since it uses less digits than its factorization.

440344221421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166165 (or 166152 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 31.

Adding to 440344221421 its reverse (124122443044), we get a palindrome (564466664465).

The spelling of 440344221421 in words is "four hundred forty billion, three hundred forty-four million, two hundred twenty-one thousand, four hundred twenty-one".