6228221 has 4 divisors (see below), whose sum is σ = 6283452. Its totient is φ = 6172992.

The previous prime is 6228203. The next prime is 6228223. The reversal of 6228221 is 1228226.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1228226 = 2 ⋅614113.

It can be written as a sum of positive squares in 2 ways, for example, as 3024121 + 3204100 = 1739^2 + 1790^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6228221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6228223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27446 + ... + 27671.

It is an arithmetic number, because the mean of its divisors is an integer number (1570863).

Almost surely, 2^6228221 is an apocalyptic number.

It is an amenable number.

6228221 is a deficient number, since it is larger than the sum of its proper divisors (55231).

6228221 is a wasteful number, since it uses less digits than its factorization.

6228221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55230.

The product of its digits is 768, while the sum is 23.

The square root of 6228221 is about 2495.6403987754. The cubic root of 6228221 is about 183.9873672014.

The spelling of 6228221 in words is "six million, two hundred twenty-eight thousand, two hundred twenty-one".