440221434421 has 4 divisors (see below), whose sum is σ = 441201883500. Its totient is φ = 439240985344.

The previous prime is 440221434397. The next prime is 440221434451. The reversal of 440221434421 is 124434122044.

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 129650404900 + 310571029521 = 360070^2 + 557289^2 .

It is a cyclic number.

It is not a de Polignac number, because 440221434421 - 2⁷ = 440221434293 is a prime.

It is a super-2 number, since 2×440221434421² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (440221434451) 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, 490223866 + ... + 490224763.

It is an arithmetic number, because the mean of its divisors is an integer number (110300470875).

Almost surely, 2^440221434421 is an apocalyptic number.

It is an amenable number.

440221434421 is a deficient number, since it is larger than the sum of its proper divisors (980449079).

440221434421 is an equidigital number, since it uses as much as digits as its factorization.

440221434421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 980449078.

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

Adding to 440221434421 its reverse (124434122044), we get a palindrome (564655556465).

The spelling of 440221434421 in words is "four hundred forty billion, two hundred twenty-one million, four hundred thirty-four thousand, four hundred twenty-one".