2400121 has 4 divisors (see below), whose sum is σ = 2406244. Its totient is φ = 2394000.

The previous prime is 2400109. The next prime is 2400143. The reversal of 2400121 is 1210042.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1210042 = 2 ⋅605021.

It can be written as a sum of positive squares in 2 ways, for example, as 810000 + 1590121 = 900^2 + 1261^2 .

It is a cyclic number.

It is not a de Polignac number, because 2400121 - 2⁵ = 2400089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2400098 and 2400107.

It is not an unprimeable number, because it can be changed into a prime (2400161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2430 + ... + 3271.

It is an arithmetic number, because the mean of its divisors is an integer number (601561).

2^2400121 is an apocalyptic number.

It is an amenable number.

2400121 is a deficient number, since it is larger than the sum of its proper divisors (6123).

2400121 is an equidigital number, since it uses as much as digits as its factorization.

2400121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6122.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 2400121 is about 1549.2323905728. The cubic root of 2400121 is about 133.8888400171. Note that the first 4 decimals are identical.

Adding to 2400121 its reverse (1210042), we get a palindrome (3610163).

The spelling of 2400121 in words is "two million, four hundred thousand, one hundred twenty-one".