2121121210111 has 8 divisors (see below), whose sum is σ = 2166917529024. Its totient is φ = 2075352644640.

The previous prime is 2121121210057. The next prime is 2121121210123. The reversal of 2121121210111 is 1110121211212.

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 2121121210111 - 2⁷ = 2121121209983 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 (2121121210141) 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, 6783820 + ... + 7089601.

It is an arithmetic number, because the mean of its divisors is an integer number (270864691128).

Almost surely, 2^{2121121210111} is an apocalyptic number.

2121121210111 is a deficient number, since it is larger than the sum of its proper divisors (45796318913).

2121121210111 is a wasteful number, since it uses less digits than its factorization.

2121121210111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13876721.

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

Adding to 2121121210111 its reverse (1110121211212), we get a palindrome (3231242421323).

The spelling of 2121121210111 in words is "two trillion, one hundred twenty-one billion, one hundred twenty-one million, two hundred ten thousand, one hundred eleven".