121009999 has 8 divisors (see below), whose sum is σ = 132360192. Its totient is φ = 109718040.

The previous prime is 121009997. The next prime is 121010033. The reversal of 121009999 is 999900121.

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 121009999 - 2¹ = 121009997 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 (121009991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10149 + ... + 18574.

It is an arithmetic number, because the mean of its divisors is an integer number (16545024).

Almost surely, 2^121009999 is an apocalyptic number.

121009999 is a deficient number, since it is larger than the sum of its proper divisors (11350193).

121009999 is a wasteful number, since it uses less digits than its factorization.

121009999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29117.

The product of its (nonzero) digits is 13122, while the sum is 40.

The square root of 121009999 is about 11000.4544906108. The cubic root of 121009999 is about 494.6223681723.

The spelling of 121009999 in words is "one hundred twenty-one million, nine thousand, nine hundred ninety-nine".