43224921 has 10 divisors (see below), whose sum is σ = 64570682. Its totient is φ = 28816560.

The previous prime is 43224911. The next prime is 43224941. The reversal of 43224921 is 12942234.

It can be written as a sum of positive squares in only one way, i.e., 40144896 + 3080025 = 6336^2 + 1755^2 .

It is not a de Polignac number, because 43224921 - 2⁹ = 43224409 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (43224911) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 266740 + ... + 266901.

Almost surely, 2^43224921 is an apocalyptic number.

It is an amenable number.

43224921 is a deficient number, since it is larger than the sum of its proper divisors (21345761).

43224921 is an equidigital number, since it uses as much as digits as its factorization.

43224921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 533653 (or 533644 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 43224921 is about 6574.5662214324. The cubic root of 43224921 is about 350.9495873248.

The spelling of 43224921 in words is "forty-three million, two hundred twenty-four thousand, nine hundred twenty-one".