43753998221 has 2 divisors, whose sum is σ = 43753998222. Its totient is φ = 43753998220.

The previous prime is 43753998191. The next prime is 43753998283. The reversal of 43753998221 is 12289935734.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34778520100 + 8975478121 = 186490^2 + 94739^2 .

It is a cyclic number.

It is not a de Polignac number, because 43753998221 - 2¹⁴ = 43753981837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43753998121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21876999110 + 21876999111.

It is an arithmetic number, because the mean of its divisors is an integer number (21876999111).

Almost surely, 2^43753998221 is an apocalyptic number.

It is an amenable number.

43753998221 is a deficient number, since it is larger than the sum of its proper divisors (1).

43753998221 is an equidigital number, since it uses as much as digits as its factorization.

43753998221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3265920, while the sum is 53.

The spelling of 43753998221 in words is "forty-three billion, seven hundred fifty-three million, nine hundred ninety-eight thousand, two hundred twenty-one".