2121111120121 has 8 divisors (see below), whose sum is σ = 2424618046080. Its totient is φ = 1817726957088.

The previous prime is 2121111120119. The next prime is 2121111120133. The reversal of 2121111120121 is 1210211111212.

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

It is not a de Polignac number, because 2121111120121 - 2¹ = 2121111120119 is a prime.

It is a super-2 number, since 2×2121111120121² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121111120095 and 2121111120104.

It is not an unprimeable number, because it can be changed into a prime (2121111120721) 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 7 ways as a sum of consecutive naturals, for example, 30653701 + ... + 30722818.

It is an arithmetic number, because the mean of its divisors is an integer number (303077255760).

Almost surely, 2^{2121111120121} is an apocalyptic number.

It is an amenable number.

2121111120121 is a deficient number, since it is larger than the sum of its proper divisors (303506925959).

2121111120121 is an equidigital number, since it uses as much as digits as its factorization.

2121111120121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61381463.

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 2121111120121 its reverse (1210211111212), we get a palindrome (3331322231333).

The spelling of 2121111120121 in words is "two trillion, one hundred twenty-one billion, one hundred eleven million, one hundred twenty thousand, one hundred twenty-one".