4240121 has 4 divisors (see below), whose sum is σ = 4247652. Its totient is φ = 4232592.

The previous prime is 4240111. The next prime is 4240127. The reversal of 4240121 is 1210424.

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 960400 + 3279721 = 980^2 + 1811^2 .

It is a cyclic number.

It is not a de Polignac number, because 4240121 - 2¹⁸ = 3977977 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 4240096 and 4240105.

It is not an unprimeable number, because it can be changed into a prime (4240127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2846 + ... + 4071.

It is an arithmetic number, because the mean of its divisors is an integer number (1061913).

Almost surely, 2^4240121 is an apocalyptic number.

It is an amenable number.

4240121 is a deficient number, since it is larger than the sum of its proper divisors (7531).

4240121 is an equidigital number, since it uses as much as digits as its factorization.

4240121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7530.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 4240121 is about 2059.1554093851. The cubic root of 4240121 is about 161.8549863203.

Adding to 4240121 its reverse (1210424), we get a palindrome (5450545).

The spelling of 4240121 in words is "four million, two hundred forty thousand, one hundred twenty-one".