43221523 has 4 divisors (see below), whose sum is σ = 45496360. Its totient is φ = 40946688.

The previous prime is 43221517. The next prime is 43221547. The reversal of 43221523 is 32512234.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 43221523 - 2¹⁷ = 43090451 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 43221494 and 43221503.

It is not an unprimeable number, because it can be changed into a prime (43221583) 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, 1137390 + ... + 1137427.

It is an arithmetic number, because the mean of its divisors is an integer number (11374090).

Almost surely, 2^43221523 is an apocalyptic number.

43221523 is a deficient number, since it is larger than the sum of its proper divisors (2274837).

43221523 is a wasteful number, since it uses less digits than its factorization.

43221523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2274836.

The product of its digits is 1440, while the sum is 22.

The square root of 43221523 is about 6574.3077962627. The cubic root of 43221523 is about 350.9403907940.

Adding to 43221523 its reverse (32512234), we get a palindrome (75733757).

The spelling of 43221523 in words is "forty-three million, two hundred twenty-one thousand, five hundred twenty-three".