221121112122111 has 4 divisors (see below), whose sum is σ = 294828149496152. Its totient is φ = 147414074748072.

The previous prime is 221121112122089. The next prime is 221121112122149. The reversal of 221121112122111 is 111221211121122.

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

It is not a de Polignac number, because 221121112122111 - 2¹⁴ = 221121112105727 is a prime.

It is a super-2 number, since 2×221121112122111² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221121112122151) 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, 36853518687016 + ... + 36853518687021.

It is an arithmetic number, because the mean of its divisors is an integer number (73707037374038).

Almost surely, 2^{221121112122111} is an apocalyptic number.

221121112122111 is a deficient number, since it is larger than the sum of its proper divisors (73707037374041).

221121112122111 is an equidigital number, since it uses as much as digits as its factorization.

221121112122111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73707037374040.

The product of its digits is 64, while the sum is 21.

Adding to 221121112122111 its reverse (111221211121122), we get a palindrome (332342323243233).

The spelling of 221121112122111 in words is "two hundred twenty-one trillion, one hundred twenty-one billion, one hundred twelve million, one hundred twenty-two thousand, one hundred eleven".