121111102001999 has 4 divisors (see below), whose sum is σ = 127485370528440. Its totient is φ = 114736833475560.

The previous prime is 121111102001957. The next prime is 121111102002061. The reversal of 121111102001999 is 999100201111121.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 121111102001999 - 2²⁴ = 121111085224783 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 (121111102009999) 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 3 ways as a sum of consecutive naturals, for example, 3187134263192 + ... + 3187134263229.

It is an arithmetic number, because the mean of its divisors is an integer number (31871342632110).

Almost surely, 2^{121111102001999} is an apocalyptic number.

121111102001999 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

121111102001999 is a deficient number, since it is larger than the sum of its proper divisors (6374268526441).

121111102001999 is an equidigital number, since it uses as much as digits as its factorization.

121111102001999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6374268526440.

The product of its (nonzero) digits is 2916, while the sum is 38.

The spelling of 121111102001999 in words is "one hundred twenty-one trillion, one hundred eleven billion, one hundred two million, one thousand, nine hundred ninety-nine".