2121101221111 has 4 divisors (see below), whose sum is σ = 2121193349800. Its totient is φ = 2121009092424.

The previous prime is 2121101221097. The next prime is 2121101221123. The reversal of 2121101221111 is 1111221011212.

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 2121101221111 - 2¹⁵ = 2121101188343 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 (2121101221511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46029801 + ... + 46075858.

It is an arithmetic number, because the mean of its divisors is an integer number (530298337450).

Almost surely, 2^{2121101221111} is an apocalyptic number.

2121101221111 is a deficient number, since it is larger than the sum of its proper divisors (92128689).

2121101221111 is an equidigital number, since it uses as much as digits as its factorization.

2121101221111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92128688.

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

Adding to 2121101221111 its reverse (1111221011212), we get a palindrome (3232322232323).

The spelling of 2121101221111 in words is "two trillion, one hundred twenty-one billion, one hundred one million, two hundred twenty-one thousand, one hundred eleven".