43228421 has 4 divisors (see below), whose sum is σ = 43837344. Its totient is φ = 42619500.

The previous prime is 43228417. The next prime is 43228429. The reversal of 43228421 is 12482234.

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 43228421 - 2² = 43228417 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43228429) 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, 304355 + ... + 304496.

It is an arithmetic number, because the mean of its divisors is an integer number (10959336).

Almost surely, 2^43228421 is an apocalyptic number.

It is an amenable number.

43228421 is a deficient number, since it is larger than the sum of its proper divisors (608923).

43228421 is an equidigital number, since it uses as much as digits as its factorization.

43228421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 608922.

The product of its digits is 3072, while the sum is 26.

The square root of 43228421 is about 6574.8323933010. The cubic root of 43228421 is about 350.9590594100.

The spelling of 43228421 in words is "forty-three million, two hundred twenty-eight thousand, four hundred twenty-one".