99506031523421 has 2 divisors, whose sum is σ = 99506031523422. Its totient is φ = 99506031523420.

The previous prime is 99506031523403. The next prime is 99506031523453. The reversal of 99506031523421 is 12432513060599.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69309138194521 + 30196893328900 = 8325211^2 + 5495170^2 .

It is a cyclic number.

It is not a de Polignac number, because 99506031523421 - 2¹⁰ = 99506031522397 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 99506031523421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99506031523021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49753015761710 + 49753015761711.

It is an arithmetic number, because the mean of its divisors is an integer number (49753015761711).

Almost surely, 2^{99506031523421} is an apocalyptic number.

It is an amenable number.

99506031523421 is a deficient number, since it is larger than the sum of its proper divisors (1).

99506031523421 is an equidigital number, since it uses as much as digits as its factorization.

99506031523421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1749600, while the sum is 50.

The spelling of 99506031523421 in words is "ninety-nine trillion, five hundred six billion, thirty-one million, five hundred twenty-three thousand, four hundred twenty-one".