2110121112221 has 4 divisors (see below), whose sum is σ = 2110270219932. Its totient is φ = 2109972004512.

The previous prime is 2110121112181. The next prime is 2110121112227. The reversal of 2110121112221 is 1222111210112.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1338385216996 + 771735895225 = 1156886^2 + 878485^2 .

It is a cyclic number.

It is not a de Polignac number, because 2110121112221 - 2²⁶ = 2110054003357 is a prime.

It is a super-2 number, since 2×2110121112221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2110121112221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2110121112227) 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, 74532626 + ... + 74560931.

It is an arithmetic number, because the mean of its divisors is an integer number (527567554983).

Almost surely, 2^{2110121112221} is an apocalyptic number.

It is an amenable number.

2110121112221 is a deficient number, since it is larger than the sum of its proper divisors (149107711).

2110121112221 is a wasteful number, since it uses less digits than its factorization.

2110121112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149107710.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 2110121112221 its reverse (1222111210112), we get a palindrome (3332232322333).

The spelling of 2110121112221 in words is "two trillion, one hundred ten billion, one hundred twenty-one million, one hundred twelve thousand, two hundred twenty-one".