2121021110111 has 4 divisors (see below), whose sum is σ = 2142021319224. Its totient is φ = 2100020901000.

The previous prime is 2121021110099. The next prime is 2121021110129. The reversal of 2121021110111 is 1110111201212.

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

It is a cyclic number.

It is not a de Polignac number, because 2121021110111 - 2¹⁴ = 2121021093727 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 (2121021110191) 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 3 ways as a sum of consecutive naturals, for example, 10500104405 + ... + 10500104606.

It is an arithmetic number, because the mean of its divisors is an integer number (535505329806).

Almost surely, 2^{2121021110111} is an apocalyptic number.

2121021110111 is a deficient number, since it is larger than the sum of its proper divisors (21000209113).

2121021110111 is a wasteful number, since it uses less digits than its factorization.

2121021110111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21000209112.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 2121021110111 its reverse (1110111201212), we get a palindrome (3231132311323).

The spelling of 2121021110111 in words is "two trillion, one hundred twenty-one billion, twenty-one million, one hundred ten thousand, one hundred eleven".