6402221 has 16 divisors (see below), whose sum is σ = 7916160. Its totient is φ = 5054400.

The previous prime is 6402203. The next prime is 6402247. The reversal of 6402221 is 1222046.

It is a cyclic number.

It is not a de Polignac number, because 6402221 - 2⁶ = 6402157 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 6402221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6402271) 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 15 ways as a sum of consecutive naturals, for example, 4271 + ... + 5571.

It is an arithmetic number, because the mean of its divisors is an integer number (494760).

Almost surely, 2^6402221 is an apocalyptic number.

It is an amenable number.

6402221 is a deficient number, since it is larger than the sum of its proper divisors (1513939).

6402221 is a wasteful number, since it uses less digits than its factorization.

6402221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1364.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 6402221 is about 2530.2610537255. The cubic root of 6402221 is about 185.6850278789.

Adding to 6402221 its reverse (1222046), we get a palindrome (7624267).

The spelling of 6402221 in words is "six million, four hundred two thousand, two hundred twenty-one".