99231930121 has 3 divisors (see below), whose sum is σ = 99232245133. Its totient is φ = 99231615110.

The previous prime is 99231930047. The next prime is 99231930131. The reversal of 99231930121 is 12103913299.

The square root of 99231930121 is 315011.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12103913299 = 20441 ⋅592139.

It is not a de Polignac number, because 99231930121 - 2⁹ = 99231929609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99231930131) 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 in 2 ways as a sum of consecutive naturals, for example, 157506 + ... + 472516.

Almost surely, 2^99231930121 is an apocalyptic number.

99231930121 is the 315011-st square number.

99231930121 is the 157506-th centered octagonal number.

It is an amenable number.

99231930121 is a deficient number, since it is larger than the sum of its proper divisors (315012).

99231930121 is an frugal number, since it uses more digits than its factorization.

99231930121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630022 (or 315011 counting only the distinct ones).

The product of its (nonzero) digits is 26244, while the sum is 40.

The spelling of 99231930121 in words is "ninety-nine billion, two hundred thirty-one million, nine hundred thirty thousand, one hundred twenty-one".