43421421 has 8 divisors (see below), whose sum is σ = 59762944. Its totient is φ = 28013760.

The previous prime is 43421393. The next prime is 43421429. The reversal of 43421421 is 12412434.

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

It is not a de Polignac number, because 43421421 - 2¹³ = 43413229 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 (43421429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 233356 + ... + 233541.

It is an arithmetic number, because the mean of its divisors is an integer number (7470368).

Almost surely, 2^43421421 is an apocalyptic number.

It is an amenable number.

43421421 is a deficient number, since it is larger than the sum of its proper divisors (16341523).

43421421 is a wasteful number, since it uses less digits than its factorization.

43421421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466931.

The product of its digits is 768, while the sum is 21.

The square root of 43421421 is about 6589.4932278590. The cubic root of 43421421 is about 351.4805877746.

Adding to 43421421 its reverse (12412434), we get a palindrome (55833855).

The spelling of 43421421 in words is "forty-three million, four hundred twenty-one thousand, four hundred twenty-one".