43124021 has 4 divisors (see below), whose sum is σ = 43453344. Its totient is φ = 42794700.

The previous prime is 43124017. The next prime is 43124023. The reversal of 43124021 is 12042134.

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 43124021 - 2² = 43124017 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 (43124023) 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, 164465 + ... + 164726.

It is an arithmetic number, because the mean of its divisors is an integer number (10863336).

Almost surely, 2^43124021 is an apocalyptic number.

It is an amenable number.

43124021 is a deficient number, since it is larger than the sum of its proper divisors (329323).

43124021 is a wasteful number, since it uses less digits than its factorization.

43124021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329322.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 43124021 is about 6566.8882280727. Note that the first 3 decimals coincide. The cubic root of 43124021 is about 350.6763005147.

Adding to 43124021 its reverse (12042134), we get a palindrome (55166155).

The spelling of 43124021 in words is "forty-three million, one hundred twenty-four thousand, twenty-one".