43121323 has 6 divisors (see below), whose sum is σ = 50161596. Its totient is φ = 36961092.

The previous prime is 43121311. The next prime is 43121329. The reversal of 43121323 is 32312134.

It is not a de Polignac number, because 43121323 - 2⁵ = 43121291 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 43121323.

It is not an unprimeable number, because it can be changed into a prime (43121329) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 439965 + ... + 440062.

It is an arithmetic number, because the mean of its divisors is an integer number (8360266).

Almost surely, 2^43121323 is an apocalyptic number.

43121323 is a deficient number, since it is larger than the sum of its proper divisors (7040273).

43121323 is an equidigital number, since it uses as much as digits as its factorization.

43121323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 880041 (or 880034 counting only the distinct ones).

The product of its digits is 432, while the sum is 19.

The square root of 43121323 is about 6566.6828003186. The cubic root of 43121323 is about 350.6689871554.

Adding to 43121323 its reverse (32312134), we get a palindrome (75433457).

The spelling of 43121323 in words is "forty-three million, one hundred twenty-one thousand, three hundred twenty-three".