99556833121 has 4 divisors (see below), whose sum is σ = 99584622592. Its totient is φ = 99529043652.

The previous prime is 99556833059. The next prime is 99556833139. The reversal of 99556833121 is 12133865599.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12133865599 = 53327 ⋅227537.

It is a cyclic number.

It is not a de Polignac number, because 99556833121 - 2¹⁹ = 99556308833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99556833421) 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 3 ways as a sum of consecutive naturals, for example, 13889361 + ... + 13896526.

It is an arithmetic number, because the mean of its divisors is an integer number (24896155648).

Almost surely, 2^99556833121 is an apocalyptic number.

It is an amenable number.

99556833121 is a deficient number, since it is larger than the sum of its proper divisors (27789471).

99556833121 is a wasteful number, since it uses less digits than its factorization.

99556833121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27789470.

The product of its digits is 1749600, while the sum is 52.

The spelling of 99556833121 in words is "ninety-nine billion, five hundred fifty-six million, eight hundred thirty-three thousand, one hundred twenty-one".