43212421 has 8 divisors (see below), whose sum is σ = 49448960. Its totient is φ = 36991728.

The previous prime is 43212409. The next prime is 43212431. The reversal of 43212421 is 12421234.

43212421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 43212421 - 2⁷ = 43212293 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 (43212431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2620 + ... + 9658.

It is an arithmetic number, because the mean of its divisors is an integer number (6181120).

Almost surely, 2^43212421 is an apocalyptic number.

It is an amenable number.

43212421 is a deficient number, since it is larger than the sum of its proper divisors (6236539).

43212421 is an equidigital number, since it uses as much as digits as its factorization.

43212421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7923.

The product of its digits is 384, while the sum is 19.

The square root of 43212421 is about 6573.6155196361. The cubic root of 43212421 is about 350.9157542744.

Adding to 43212421 its reverse (12421234), we get a palindrome (55633655).

The spelling of 43212421 in words is "forty-three million, two hundred twelve thousand, four hundred twenty-one".