121002099999 has 32 divisors (see below), whose sum is σ = 180796237056. Its totient is φ = 71338245120.

The previous prime is 121002099997. The next prime is 121002100069. The reversal of 121002099999 is 999990200121.

It is not a de Polignac number, because 121002099999 - 2¹ = 121002099997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121002099997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11700559 + ... + 11710895.

It is an arithmetic number, because the mean of its divisors is an integer number (5649882408).

Almost surely, 2^121002099999 is an apocalyptic number.

121002099999 is a deficient number, since it is larger than the sum of its proper divisors (59794137057).

121002099999 is a wasteful number, since it uses less digits than its factorization.

121002099999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19975.

The product of its (nonzero) digits is 236196, while the sum is 51.

The spelling of 121002099999 in words is "one hundred twenty-one billion, two million, ninety-nine thousand, nine hundred ninety-nine".