121221201000999 has 16 divisors (see below), whose sum is σ = 178805151800064. Its totient is φ = 72432642508800.

The previous prime is 121221201000973. The next prime is 121221201001013. The reversal of 121221201000999 is 999000102122121.

It is a happy number.

It is not a de Polignac number, because 121221201000999 - 2³⁵ = 121186841262631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221201000959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25868798554 + ... + 25868803239.

It is an arithmetic number, because the mean of its divisors is an integer number (11175321987504).

Almost surely, 2^{121221201000999} is an apocalyptic number.

121221201000999 is a deficient number, since it is larger than the sum of its proper divisors (57583950799065).

121221201000999 is a wasteful number, since it uses less digits than its factorization.

121221201000999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51737601878.

The product of its (nonzero) digits is 11664, while the sum is 39.

The spelling of 121221201000999 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, two hundred one million, nine hundred ninety-nine", and thus it is an aban number.