43013221 has 2 divisors, whose sum is σ = 43013222. Its totient is φ = 43013220.

The previous prime is 43013219. The next prime is 43013227. The reversal of 43013221 is 12231034.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36180225 + 6832996 = 6015^2 + 2614^2 .

It is a cyclic number.

It is not a de Polignac number, because 43013221 - 2¹ = 43013219 is a prime.

Together with 43013219, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 43013195 and 43013204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43013227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21506610 + 21506611.

It is an arithmetic number, because the mean of its divisors is an integer number (21506611).

Almost surely, 2^43013221 is an apocalyptic number.

It is an amenable number.

43013221 is a deficient number, since it is larger than the sum of its proper divisors (1).

43013221 is an equidigital number, since it uses as much as digits as its factorization.

43013221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 43013221 is about 6558.4465386248. The cubic root of 43013221 is about 350.3757081158.

Adding to 43013221 its reverse (12231034), we get a palindrome (55244255).

It can be divided in two parts, 43013 and 221, that added together give a palindrome (43234).

The spelling of 43013221 in words is "forty-three million, thirteen thousand, two hundred twenty-one".