2120121 has 32 divisors (see below), whose sum is σ = 3456000.
Its totient is φ = 1278720.
The previous prime is 2120119. The next prime is 2120143. The reversal of 2120121 is 1210212.
It is not a de Polignac number, because 2120121 - 21 = 2120119 is a prime.
It is a Harshad number since it is a multiple of its sum of digits (9).
It is not an unprimeable number, because it can be changed into a prime (2120101) by changing a digit.
It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14155 + ... + 14303.
It is an arithmetic number, because the mean of its divisors is an integer number (108000).
22120121 is an apocalyptic number.
It is an amenable number.
2120121 is a deficient number, since it is larger than the sum of its proper divisors (1335879).
2120121 is a wasteful number, since it uses less digits than its factorization.
2120121 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 206 (or 200 counting only the distinct ones).
The product of its (nonzero) digits is 8, while the sum is 9.
The square root of 2120121 is about 1456.0635288338.
The cubic root of 2120121 is about 128.4656097567.
Adding to 2120121 its reverse (1210212), we get a palindrome (3330333).
Subtracting from 2120121 its reverse (1210212), we obtain a palindrome (909909).
The spelling of 2120121 in words is "two million, one hundred twenty thousand, one hundred twenty-one".