99681823121 has 2 divisors, whose sum is σ = 99681823122. Its totient is φ = 99681823120.

The previous prime is 99681823103. The next prime is 99681823127. The reversal of 99681823121 is 12132818699.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99659544721 + 22278400 = 315689^2 + 4720^2 .

It is a cyclic number.

It is not a de Polignac number, because 99681823121 - 2¹⁴ = 99681806737 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 99681823121.

It is not a weakly prime, because it can be changed into another prime (99681823127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49840911560 + 49840911561.

It is an arithmetic number, because the mean of its divisors is an integer number (49840911561).

Almost surely, 2^99681823121 is an apocalyptic number.

It is an amenable number.

99681823121 is a deficient number, since it is larger than the sum of its proper divisors (1).

99681823121 is an equidigital number, since it uses as much as digits as its factorization.

99681823121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 373248, while the sum is 50.

The spelling of 99681823121 in words is "ninety-nine billion, six hundred eighty-one million, eight hundred twenty-three thousand, one hundred twenty-one".