43125221 has 4 divisors (see below), whose sum is σ = 43143744. Its totient is φ = 43106700.

The previous prime is 43125197. The next prime is 43125227. The reversal of 43125221 is 12252134.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12252134 = 2 ⋅6126067.

It is a cyclic number.

It is not a de Polignac number, because 43125221 - 2¹⁸ = 42863077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 43125193 and 43125202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43125227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5165 + ... + 10626.

It is an arithmetic number, because the mean of its divisors is an integer number (10785936).

Almost surely, 2^43125221 is an apocalyptic number.

It is an amenable number.

43125221 is a deficient number, since it is larger than the sum of its proper divisors (18523).

43125221 is a wasteful number, since it uses less digits than its factorization.

43125221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18522.

The product of its digits is 480, while the sum is 20.

The square root of 43125221 is about 6566.9795949127. The cubic root of 43125221 is about 350.6795532082.

Adding to 43125221 its reverse (12252134), we get a palindrome (55377355).

It can be divided in two parts, 431 and 25221, that added together give a palindrome (25652).

The spelling of 43125221 in words is "forty-three million, one hundred twenty-five thousand, two hundred twenty-one".