43447040421 has 4 divisors (see below), whose sum is σ = 57929387232. Its totient is φ = 28964693612.

The previous prime is 43447040419. The next prime is 43447040431. The reversal of 43447040421 is 12404074434.

43447040421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 43447040421 - 2¹ = 43447040419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43447040431) 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, 7241173401 + ... + 7241173406.

It is an arithmetic number, because the mean of its divisors is an integer number (14482346808).

Almost surely, 2^43447040421 is an apocalyptic number.

It is an amenable number.

43447040421 is a deficient number, since it is larger than the sum of its proper divisors (14482346811).

43447040421 is a wasteful number, since it uses less digits than its factorization.

43447040421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14482346810.

The product of its (nonzero) digits is 43008, while the sum is 33.

The spelling of 43447040421 in words is "forty-three billion, four hundred forty-seven million, forty thousand, four hundred twenty-one".