43916221 has 2 divisors, whose sum is σ = 43916222. Its totient is φ = 43916220.

The previous prime is 43916183. The next prime is 43916233. The reversal of 43916221 is 12261934.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36132121 + 7784100 = 6011^2 + 2790^2 .

It is a cyclic number.

It is not a de Polignac number, because 43916221 - 2²¹ = 41819069 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 43916221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43916251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21958110 + 21958111.

It is an arithmetic number, because the mean of its divisors is an integer number (21958111).

Almost surely, 2^43916221 is an apocalyptic number.

It is an amenable number.

43916221 is a deficient number, since it is larger than the sum of its proper divisors (1).

43916221 is an equidigital number, since it uses as much as digits as its factorization.

43916221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 28.

The square root of 43916221 is about 6626.9314920256. The cubic root of 43916221 is about 352.8106237042.

The spelling of 43916221 in words is "forty-three million, nine hundred sixteen thousand, two hundred twenty-one".