6211221 has 16 divisors (see below), whose sum is σ = 8585280. Its totient is φ = 3991680.

The previous prime is 6211187. The next prime is 6211223. The reversal of 6211221 is 1221126.

It is not a de Polignac number, because 6211221 - 2¹¹ = 6209173 is a prime.

6211221 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 6211221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6211223) 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 15 ways as a sum of consecutive naturals, for example, 11211 + ... + 11751.

It is an arithmetic number, because the mean of its divisors is an integer number (536580).

Almost surely, 2^6211221 is an apocalyptic number.

It is an amenable number.

6211221 is a deficient number, since it is larger than the sum of its proper divisors (2374059).

6211221 is a wasteful number, since it uses less digits than its factorization.

6211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 676.

The product of its digits is 48, while the sum is 15.

The square root of 6211221 is about 2492.2321320455. The cubic root of 6211221 is about 183.8198161280.

Adding to 6211221 its reverse (1221126), we get a palindrome (7432347).

The spelling of 6211221 in words is "six million, two hundred eleven thousand, two hundred twenty-one".