43201658921 has 2 divisors, whose sum is σ = 43201658922. Its totient is φ = 43201658920.

The previous prime is 43201658879. The next prime is 43201658947. The reversal of 43201658921 is 12985610234.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37379968921 + 5821690000 = 193339^2 + 76300^2 .

It is a cyclic number.

It is not a de Polignac number, because 43201658921 - 2¹⁰ = 43201657897 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (43201658321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21600829460 + 21600829461.

It is an arithmetic number, because the mean of its divisors is an integer number (21600829461).

Almost surely, 2^43201658921 is an apocalyptic number.

It is an amenable number.

43201658921 is a deficient number, since it is larger than the sum of its proper divisors (1).

43201658921 is an equidigital number, since it uses as much as digits as its factorization.

43201658921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 103680, while the sum is 41.

The spelling of 43201658921 in words is "forty-three billion, two hundred one million, six hundred fifty-eight thousand, nine hundred twenty-one".