43628066221 has 2 divisors, whose sum is σ = 43628066222. Its totient is φ = 43628066220.

The previous prime is 43628066179. The next prime is 43628066243. The reversal of 43628066221 is 12266082634.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27138938121 + 16489128100 = 164739^2 + 128410^2 .

It is a cyclic number.

It is not a de Polignac number, because 43628066221 - 2⁹ = 43628065709 is a prime.

It is a super-2 number, since 2×43628066221² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43628066621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21814033110 + 21814033111.

It is an arithmetic number, because the mean of its divisors is an integer number (21814033111).

Almost surely, 2^43628066221 is an apocalyptic number.

It is an amenable number.

43628066221 is a deficient number, since it is larger than the sum of its proper divisors (1).

43628066221 is an equidigital number, since it uses as much as digits as its factorization.

43628066221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 165888, while the sum is 40.

The spelling of 43628066221 in words is "forty-three billion, six hundred twenty-eight million, sixty-six thousand, two hundred twenty-one".