43323421 has 4 divisors (see below), whose sum is σ = 45207072. Its totient is φ = 41439772.

The previous prime is 43323407. The next prime is 43323431. The reversal of 43323421 is 12432334.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 43323421 - 2¹⁷ = 43192349 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 43323392 and 43323401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43323431) 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, 941791 + ... + 941836.

It is an arithmetic number, because the mean of its divisors is an integer number (11301768).

Almost surely, 2^43323421 is an apocalyptic number.

It is an amenable number.

43323421 is a deficient number, since it is larger than the sum of its proper divisors (1883651).

43323421 is a wasteful number, since it uses less digits than its factorization.

43323421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1883650.

The product of its digits is 1728, while the sum is 22.

The square root of 43323421 is about 6582.0529472194. The cubic root of 43323421 is about 351.2159638250.

Adding to 43323421 its reverse (12432334), we get a palindrome (55755755).

The spelling of 43323421 in words is "forty-three million, three hundred twenty-three thousand, four hundred twenty-one".