44444444421 has 16 divisors (see below), whose sum is σ = 66018274560. Its totient is φ = 26407308480.

The previous prime is 44444444413. The next prime is 44444444441. The reversal of 44444444421 is 12444444444.

It is not a de Polignac number, because 44444444421 - 2³ = 44444444413 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 44444444421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (44444444441) 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, 19647165 + ... + 19649426.

It is an arithmetic number, because the mean of its divisors is an integer number (4126142160).

Almost surely, 2^44444444421 is an apocalyptic number.

It is an amenable number.

44444444421 is a deficient number, since it is larger than the sum of its proper divisors (21573830139).

44444444421 is a wasteful number, since it uses less digits than its factorization.

44444444421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39296636.

The product of its digits is 524288, while the sum is 39.

Adding to 44444444421 its reverse (12444444444), we get a palindrome (56888888865).

The spelling of 44444444421 in words is "forty-four billion, four hundred forty-four million, four hundred forty-four thousand, four hundred twenty-one".