43500221 has 4 divisors (see below), whose sum is σ = 44561244. Its totient is φ = 42439200.

The previous prime is 43500211. The next prime is 43500241. The reversal of 43500221 is 12200534.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 26152996 + 17347225 = 5114^2 + 4165^2 .

It is a cyclic number.

It is not a de Polignac number, because 43500221 - 2⁶ = 43500157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 43500221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43500211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 530450 + ... + 530531.

It is an arithmetic number, because the mean of its divisors is an integer number (11140311).

Almost surely, 2^43500221 is an apocalyptic number.

43500221 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

43500221 is a deficient number, since it is larger than the sum of its proper divisors (1061023).

43500221 is a wasteful number, since it uses less digits than its factorization.

43500221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1061022.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 43500221 is about 6595.4697330819. The cubic root of 43500221 is about 351.6930783854.

Adding to 43500221 its reverse (12200534), we get a palindrome (55700755).

The spelling of 43500221 in words is "forty-three million, five hundred thousand, two hundred twenty-one".