43403221 has 2 divisors, whose sum is σ = 43403222. Its totient is φ = 43403220.

The previous prime is 43403219. The next prime is 43403233. The reversal of 43403221 is 12230434.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30371121 + 13032100 = 5511^2 + 3610^2 .

It is a cyclic number.

It is not a de Polignac number, because 43403221 - 2¹ = 43403219 is a prime.

Together with 43403219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43403251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21701610 + 21701611.

It is an arithmetic number, because the mean of its divisors is an integer number (21701611).

Almost surely, 2^43403221 is an apocalyptic number.

It is an amenable number.

43403221 is a deficient number, since it is larger than the sum of its proper divisors (1).

43403221 is an equidigital number, since it uses as much as digits as its factorization.

43403221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 43403221 is about 6588.1120967998. The cubic root of 43403221 is about 351.4314734549.

Adding to 43403221 its reverse (12230434), we get a palindrome (55633655).

The spelling of 43403221 in words is "forty-three million, four hundred three thousand, two hundred twenty-one".