43142521 has 4 divisors (see below), whose sum is σ = 45413200. Its totient is φ = 40871844.

The previous prime is 43142467. The next prime is 43142531. The reversal of 43142521 is 12524134.

43142521 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 43142521 - 2⁹ = 43142009 is a prime.

It is a super-2 number, since 2×43142521² = 3722554236470882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 43142492 and 43142501.

It is not an unprimeable number, because it can be changed into a prime (43142531) 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, 1135311 + ... + 1135348.

It is an arithmetic number, because the mean of its divisors is an integer number (11353300).

Almost surely, 2^43142521 is an apocalyptic number.

It is an amenable number.

43142521 is a deficient number, since it is larger than the sum of its proper divisors (2270679).

43142521 is a wasteful number, since it uses less digits than its factorization.

43142521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2270678.

The product of its digits is 960, while the sum is 22.

The square root of 43142521 is about 6568.2966589520. The cubic root of 43142521 is about 350.7264395009.

Adding to 43142521 its reverse (12524134), we get a palindrome (55666655).

The spelling of 43142521 in words is "forty-three million, one hundred forty-two thousand, five hundred twenty-one".