43432221 has 8 divisors (see below), whose sum is σ = 66182464. Its totient is φ = 24818400.

The previous prime is 43432199. The next prime is 43432231. The reversal of 43432221 is 12223434.

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

It is not a de Polignac number, because 43432221 - 2⁵ = 43432189 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 2068201 = 43432221 / (4 + 3 + 4 + 3 + 2 + 2 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43432231) 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, 1034080 + ... + 1034121.

It is an arithmetic number, because the mean of its divisors is an integer number (8272808).

Almost surely, 2^43432221 is an apocalyptic number.

It is an amenable number.

43432221 is a deficient number, since it is larger than the sum of its proper divisors (22750243).

43432221 is a wasteful number, since it uses less digits than its factorization.

43432221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2068211.

The product of its digits is 1152, while the sum is 21.

The square root of 43432221 is about 6590.3126632960. The cubic root of 43432221 is about 351.5097260477.

Adding to 43432221 its reverse (12223434), we get a palindrome (55655655).

The spelling of 43432221 in words is "forty-three million, four hundred thirty-two thousand, two hundred twenty-one".