43125021 has 16 divisors (see below), whose sum is σ = 64038720. Its totient is φ = 28682640.

The previous prime is 43125013. The next prime is 43125031. The reversal of 43125021 is 12052134.

It is not a de Polignac number, because 43125021 - 2³ = 43125013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 43124985 and 43125003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43125031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11631 + ... + 14883.

It is an arithmetic number, because the mean of its divisors is an integer number (4002420).

Almost surely, 2^43125021 is an apocalyptic number.

It is an amenable number.

43125021 is a deficient number, since it is larger than the sum of its proper divisors (20913699).

43125021 is a wasteful number, since it uses less digits than its factorization.

43125021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3753 (or 3747 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 43125021 is about 6566.9643671943. The cubic root of 43125021 is about 350.6790110968.

Adding to 43125021 its reverse (12052134), we get a palindrome (55177155).

It can be divided in two parts, 431 and 25021, that added together give a palindrome (25452).

The spelling of 43125021 in words is "forty-three million, one hundred twenty-five thousand, twenty-one".