43542021 has 8 divisors (see below), whose sum is σ = 60058080. Its totient is φ = 28026992.

The previous prime is 43542019. The next prime is 43542043. The reversal of 43542021 is 12024534.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 43542021 - 2¹ = 43542019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43542001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 250155 + ... + 250328.

It is an arithmetic number, because the mean of its divisors is an integer number (7507260).

Almost surely, 2^43542021 is an apocalyptic number.

It is an amenable number.

43542021 is a deficient number, since it is larger than the sum of its proper divisors (16516059).

43542021 is a wasteful number, since it uses less digits than its factorization.

43542021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500515.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 43542021 is about 6598.6378139734. The cubic root of 43542021 is about 351.8056913340.

Adding to 43542021 its reverse (12024534), we get a palindrome (55566555).

The spelling of 43542021 in words is "forty-three million, five hundred forty-two thousand, twenty-one".