43452421 has 12 divisors (see below), whose sum is σ = 45808000. Its totient is φ = 41174640.

The previous prime is 43452413. The next prime is 43452457. The reversal of 43452421 is 12425434.

It is a happy number.

It is not a de Polignac number, because 43452421 - 2³ = 43452413 is a prime.

It is a super-2 number, since 2×43452421² = 3776225781522482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43452401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 86830 + ... + 87328.

Almost surely, 2^43452421 is an apocalyptic number.

It is an amenable number.

43452421 is a deficient number, since it is larger than the sum of its proper divisors (2355579).

43452421 is an equidigital number, since it uses as much as digits as its factorization.

43452421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636 (or 583 counting only the distinct ones).

The product of its digits is 3840, while the sum is 25.

The square root of 43452421 is about 6591.8450376203. The cubic root of 43452421 is about 351.5642124466.

Adding to 43452421 its reverse (12425434), we get a palindrome (55877855).

The spelling of 43452421 in words is "forty-three million, four hundred fifty-two thousand, four hundred twenty-one".