4440044220421 has 4 divisors (see below), whose sum is σ = 4440287969452. Its totient is φ = 4439800471392.

The previous prime is 4440044220407. The next prime is 4440044220463. The reversal of 4440044220421 is 1240224400444.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1078303635396 + 3361740585025 = 1038414^2 + 1833505^2 .

It is a cyclic number.

It is not a de Polignac number, because 4440044220421 - 2¹⁵ = 4440044187653 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 (4440044226421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121847190 + ... + 121883623.

It is an arithmetic number, because the mean of its divisors is an integer number (1110071992363).

Almost surely, 2^{4440044220421} is an apocalyptic number.

It is an amenable number.

4440044220421 is a deficient number, since it is larger than the sum of its proper divisors (243749031).

4440044220421 is a wasteful number, since it uses less digits than its factorization.

4440044220421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243749030.

The product of its (nonzero) digits is 32768, while the sum is 31.

Adding to 4440044220421 its reverse (1240224400444), we get a palindrome (5680268620865).

The spelling of 4440044220421 in words is "four trillion, four hundred forty billion, forty-four million, two hundred twenty thousand, four hundred twenty-one".