43423121 has 16 divisors (see below), whose sum is σ = 51561600. Its totient is φ = 35779968.

The previous prime is 43423111. The next prime is 43423147. The reversal of 43423121 is 12132434.

It is a de Polignac number, because none of the positive numbers 2^k-43423121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 43423093 and 43423102.

It is not an unprimeable number, because it can be changed into a prime (43423111) 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, 82766 + ... + 83288.

It is an arithmetic number, because the mean of its divisors is an integer number (3222600).

Almost surely, 2^43423121 is an apocalyptic number.

It is an amenable number.

43423121 is a deficient number, since it is larger than the sum of its proper divisors (8138479).

43423121 is a wasteful number, since it uses less digits than its factorization.

43423121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 968.

The product of its digits is 576, while the sum is 20.

The square root of 43423121 is about 6589.6222198241. The cubic root of 43423121 is about 351.4851746750.

Adding to 43423121 its reverse (12132434), we get a palindrome (55555555).

The spelling of 43423121 in words is "forty-three million, four hundred twenty-three thousand, one hundred twenty-one".