121011999 has 8 divisors (see below), whose sum is σ = 161484720. Its totient is φ = 80606976.

The previous prime is 121011997. The next prime is 121012013. The reversal of 121011999 is 999110121.

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

It is not a de Polignac number, because 121011999 - 2¹ = 121011997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121011997) 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, 12594 + ... + 20015.

It is an arithmetic number, because the mean of its divisors is an integer number (20185590).

Almost surely, 2^121011999 is an apocalyptic number.

121011999 is a deficient number, since it is larger than the sum of its proper divisors (40472721).

121011999 is a wasteful number, since it uses less digits than its factorization.

121011999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33849.

The product of its (nonzero) digits is 1458, while the sum is 33.

The square root of 121011999 is about 11000.5453955702. The cubic root of 121011999 is about 494.6250931242.

The spelling of 121011999 in words is "one hundred twenty-one million, eleven thousand, nine hundred ninety-nine".