2210121 has 12 divisors (see below), whose sum is σ = 3279172.
Its totient is φ = 1433376.
The previous prime is 2210107. The next prime is 2210141. The reversal of 2210121 is 1210122.
Adding to 2210121 its reverse (1210122), we get a palindrome (3420243).
Subtracting from 2210121 its reverse (1210122), we obtain a palindrome (999999).
It can be divided in two parts, 22101 and 21, that added together give a palindrome (22122).
It can be written as a sum of positive squares in 2 ways, for example, as 876096 + 1334025 = 936^2 + 1155^2
It is not a de Polignac number, because 2210121 - 26 = 2210057 is a prime.
It is a Harshad number since it is a multiple of its sum of digits (9).
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (2210141) by changing a digit.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2986 + ... + 3651.
22210121 is an apocalyptic number.
It is an amenable number.
2210121 is a deficient number, since it is larger than the sum of its proper divisors (1069051).
2210121 is a wasteful number, since it uses less digits than its factorization.
2210121 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 6680 (or 6677 counting only the distinct ones).
The product of its (nonzero) digits is 8, while the sum is 9.
The square root of 2210121 is about 1486.6475708789.
The cubic root of 2210121 is about 130.2582833483.
The spelling of 2210121 in words is "two million, two hundred ten thousand, one hundred twenty-one".