43971221 has 8 divisors (see below), whose sum is σ = 51985920. Its totient is φ = 36389808.

The previous prime is 43971217. The next prime is 43971227. The reversal of 43971221 is 12217934.

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

It is not a de Polignac number, because 43971221 - 2² = 43971217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43971227) 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, 108101 + ... + 108506.

It is an arithmetic number, because the mean of its divisors is an integer number (6498240).

Almost surely, 2^43971221 is an apocalyptic number.

It is an amenable number.

43971221 is a deficient number, since it is larger than the sum of its proper divisors (8014699).

43971221 is a wasteful number, since it uses less digits than its factorization.

43971221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216643.

The product of its digits is 3024, while the sum is 29.

The square root of 43971221 is about 6631.0799271310. The cubic root of 43971221 is about 352.9578471282.

The spelling of 43971221 in words is "forty-three million, nine hundred seventy-one thousand, two hundred twenty-one".