99923635121 has 2 divisors, whose sum is σ = 99923635122. Its totient is φ = 99923635120.

The previous prime is 99923635109. The next prime is 99923635151. The reversal of 99923635121 is 12153632999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87757545121 + 12166090000 = 296239^2 + 110300^2 .

It is an emirp because it is prime and its reverse (12153632999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99923635121 - 2⁶ = 99923635057 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 99923635121.

It is not a weakly prime, because it can be changed into another prime (99923635151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49961817560 + 49961817561.

It is an arithmetic number, because the mean of its divisors is an integer number (49961817561).

Almost surely, 2^99923635121 is an apocalyptic number.

It is an amenable number.

99923635121 is a deficient number, since it is larger than the sum of its proper divisors (1).

99923635121 is an equidigital number, since it uses as much as digits as its factorization.

99923635121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 787320, while the sum is 50.

The spelling of 99923635121 in words is "ninety-nine billion, nine hundred twenty-three million, six hundred thirty-five thousand, one hundred twenty-one".