43440413221 has 4 divisors (see below), whose sum is σ = 43466442700. Its totient is φ = 43414383744.

The previous prime is 43440413213. The next prime is 43440413239. The reversal of 43440413221 is 12231404434.

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 36246828996 + 7193584225 = 190386^2 + 84815^2 .

It is a cyclic number.

It is not a de Polignac number, because 43440413221 - 2³ = 43440413213 is a prime.

It is a super-2 number, since 2×43440413221² (a number of 22 digits) contains 22 as substring.

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 43440413221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43440413281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13012236 + ... + 13015573.

It is an arithmetic number, because the mean of its divisors is an integer number (10866610675).

Almost surely, 2^43440413221 is an apocalyptic number.

It is an amenable number.

43440413221 is a deficient number, since it is larger than the sum of its proper divisors (26029479).

43440413221 is a wasteful number, since it uses less digits than its factorization.

43440413221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26029478.

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 43440413221 its reverse (12231404434), we get a palindrome (55671817655).

The spelling of 43440413221 in words is "forty-three billion, four hundred forty million, four hundred thirteen thousand, two hundred twenty-one".