43442886721 has 4 divisors (see below), whose sum is σ = 46784647252. Its totient is φ = 40101126192.

The previous prime is 43442886649. The next prime is 43442886757. The reversal of 43442886721 is 12768824434.

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 20573886096 + 22869000625 = 143436^2 + 151225^2 .

It is a cyclic number.

It is not a de Polignac number, because 43442886721 - 2¹⁵ = 43442853953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43442887721) 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, 1670880246 + ... + 1670880271.

It is an arithmetic number, because the mean of its divisors is an integer number (11696161813).

Almost surely, 2^43442886721 is an apocalyptic number.

It is an amenable number.

43442886721 is a deficient number, since it is larger than the sum of its proper divisors (3341760531).

43442886721 is a wasteful number, since it uses less digits than its factorization.

43442886721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3341760530.

The product of its digits is 2064384, while the sum is 49.

The spelling of 43442886721 in words is "forty-three billion, four hundred forty-two million, eight hundred eighty-six thousand, seven hundred twenty-one".