4320121 has 4 divisors (see below), whose sum is σ = 4652452. Its totient is φ = 3987792.

The previous prime is 4320119. The next prime is 4320187. The reversal of 4320121 is 1210234.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1210234 = 2 ⋅605117.

It can be written as a sum of positive squares in 2 ways, for example, as 1040400 + 3279721 = 1020^2 + 1811^2 .

It is a cyclic number.

It is not a de Polignac number, because 4320121 - 2¹ = 4320119 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 332317 = 4320121 / (4 + 3 + 2 + 0 + 1 + 2 + 1).

It is an Ulam number.

It is a Duffinian number.

4320121 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (4320521) 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, 166146 + ... + 166171.

It is an arithmetic number, because the mean of its divisors is an integer number (1163113).

Almost surely, 2^4320121 is an apocalyptic number.

It is an amenable number.

4320121 is a deficient number, since it is larger than the sum of its proper divisors (332331).

4320121 is a wasteful number, since it uses less digits than its factorization.

4320121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332330.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 4320121 is about 2078.4900769549. The cubic root of 4320121 is about 162.8665775580.

Adding to 4320121 its reverse (1210234), we get a palindrome (5530355).

It can be divided in two parts, 43 and 20121, that added together give a square (20164 = 142²).

The spelling of 4320121 in words is "four million, three hundred twenty thousand, one hundred twenty-one".