99905356366021 has 2 divisors, whose sum is σ = 99905356366022. Its totient is φ = 99905356366020.

The previous prime is 99905356365943. The next prime is 99905356366061. The reversal of 99905356366021 is 12066365350999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57371989824900 + 42533366541121 = 7574430^2 + 6521761^2 .

It is an emirp because it is prime and its reverse (12066365350999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99905356366021 - 2¹⁵ = 99905356333253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99905356366061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49952678183010 + 49952678183011.

It is an arithmetic number, because the mean of its divisors is an integer number (49952678183011).

Almost surely, 2^{99905356366021} is an apocalyptic number.

It is an amenable number.

99905356366021 is a deficient number, since it is larger than the sum of its proper divisors (1).

99905356366021 is an equidigital number, since it uses as much as digits as its factorization.

99905356366021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 70858800, while the sum is 64.

The spelling of 99905356366021 in words is "ninety-nine trillion, nine hundred five billion, three hundred fifty-six million, three hundred sixty-six thousand, twenty-one".