43521143 has 4 divisors (see below), whose sum is σ = 43620720. Its totient is φ = 43421568.

The previous prime is 43521119. The next prime is 43521157. The reversal of 43521143 is 34112534.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 43521143 - 2¹⁴ = 43504759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43521113) 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, 49130 + ... + 50007.

It is an arithmetic number, because the mean of its divisors is an integer number (10905180).

Almost surely, 2^43521143 is an apocalyptic number.

43521143 is a deficient number, since it is larger than the sum of its proper divisors (99577).

43521143 is an equidigital number, since it uses as much as digits as its factorization.

43521143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99576.

The product of its digits is 1440, while the sum is 23.

The square root of 43521143 is about 6597.0556311130. The cubic root of 43521143 is about 351.7494531429.

Adding to 43521143 its reverse (34112534), we get a palindrome (77633677).

The spelling of 43521143 in words is "forty-three million, five hundred twenty-one thousand, one hundred forty-three".