2403221 has 6 divisors (see below), whose sum is σ = 2438550. Its totient is φ = 2368296.

The previous prime is 2403211. The next prime is 2403229. The reversal of 2403221 is 1223042.

2403221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 1612900 + 790321 = 1270^2 + 889^2 .

It is a de Polignac number, because none of the positive numbers 2^k-2403221 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 = 2403196 and 2403205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2403229) 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 5 ways as a sum of consecutive naturals, for example, 16055 + ... + 16203.

It is an arithmetic number, because the mean of its divisors is an integer number (406425).

2^2403221 is an apocalyptic number.

It is an amenable number.

2403221 is a deficient number, since it is larger than the sum of its proper divisors (35329).

2403221 is an equidigital number, since it uses as much as digits as its factorization.

2403221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403 (or 276 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 2403221 is about 1550.2325631982. The cubic root of 2403221 is about 133.9464588951.

Adding to 2403221 its reverse (1223042), we get a palindrome (3626263).

The spelling of 2403221 in words is "two million, four hundred three thousand, two hundred twenty-one".