440412213421 has 4 divisors (see below), whose sum is σ = 455598841500. Its totient is φ = 425225585344.

The previous prime is 440412213377. The next prime is 440412213491. The reversal of 440412213421 is 124312214044.

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 242911965321 + 197500248100 = 492861^2 + 444410^2 .

It is a cyclic number.

It is not a de Polignac number, because 440412213421 - 2¹⁷ = 440412082349 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 440412213421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (440412213491) 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, 7593313996 + ... + 7593314053.

It is an arithmetic number, because the mean of its divisors is an integer number (113899710375).

Almost surely, 2^440412213421 is an apocalyptic number.

It is an amenable number.

440412213421 is a deficient number, since it is larger than the sum of its proper divisors (15186628079).

440412213421 is a wasteful number, since it uses less digits than its factorization.

440412213421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15186628078.

The product of its (nonzero) digits is 6144, while the sum is 28.

Adding to 440412213421 its reverse (124312214044), we get a palindrome (564724427465).

The spelling of 440412213421 in words is "four hundred forty billion, four hundred twelve million, two hundred thirteen thousand, four hundred twenty-one".