2121122111999 has 8 divisors (see below), whose sum is σ = 2313977993040. Its totient is φ = 1928270664000.

The previous prime is 2121122111981. The next prime is 2121122112023. The reversal of 2121122111999 is 9991112211212.

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 2121122111999 - 2²⁰ = 2121121063423 is a prime.

It is a super-2 number, since 2×2121122111999² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121122111959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65102 + ... + 2060699.

It is an arithmetic number, because the mean of its divisors is an integer number (289247249130).

Almost surely, 2^{2121122111999} is an apocalyptic number.

2121122111999 is a deficient number, since it is larger than the sum of its proper divisors (192855881041).

2121122111999 is a wasteful number, since it uses less digits than its factorization.

2121122111999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2216521.

The product of its digits is 11664, while the sum is 41.

It can be divided in two parts, 212 and 1122111999, that added together give a palindrome (1122112211).

The spelling of 2121122111999 in words is "two trillion, one hundred twenty-one billion, one hundred twenty-two million, one hundred eleven thousand, nine hundred ninety-nine".