123121009999 has 8 divisors (see below), whose sum is σ = 132706870352. Its totient is φ = 113551580160.

The previous prime is 123121009981. The next prime is 123121010003. The reversal of 123121009999 is 999900121321.

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

It is a cyclic number.

It is not a de Polignac number, because 123121009999 - 2²⁵ = 123087455567 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123121009939) 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, 4092057 + ... + 4122034.

It is an arithmetic number, because the mean of its divisors is an integer number (16588358794).

Almost surely, 2^123121009999 is an apocalyptic number.

123121009999 is a deficient number, since it is larger than the sum of its proper divisors (9585860353).

123121009999 is a wasteful number, since it uses less digits than its factorization.

123121009999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8215257.

The product of its (nonzero) digits is 78732, while the sum is 46.

The spelling of 123121009999 in words is "one hundred twenty-three billion, one hundred twenty-one million, nine thousand, nine hundred ninety-nine".