99921012123 has 8 divisors (see below), whose sum is σ = 133585197328. Its totient is φ = 66435417504.

The previous prime is 99921012101. The next prime is 99921012131. The reversal of 99921012123 is 32121012999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 99921012123 - 2⁵ = 99921012091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99921012173) 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 7 ways as a sum of consecutive naturals, for example, 44646340 + ... + 44648577.

It is an arithmetic number, because the mean of its divisors is an integer number (16698149666).

Almost surely, 2^99921012123 is an apocalyptic number.

99921012123 is a deficient number, since it is larger than the sum of its proper divisors (33664185205).

99921012123 is a wasteful number, since it uses less digits than its factorization.

99921012123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89295293.

The product of its (nonzero) digits is 17496, while the sum is 39.

The spelling of 99921012123 in words is "ninety-nine billion, nine hundred twenty-one million, twelve thousand, one hundred twenty-three".