6216221 has 4 divisors (see below), whose sum is σ = 6781344. Its totient is φ = 5651100.

The previous prime is 6216191. The next prime is 6216227. The reversal of 6216221 is 1226126.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6216221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6216193 and 6216202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6216227) 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, 282545 + ... + 282566.

It is an arithmetic number, because the mean of its divisors is an integer number (1695336).

Almost surely, 2^6216221 is an apocalyptic number.

It is an amenable number.

6216221 is a deficient number, since it is larger than the sum of its proper divisors (565123).

6216221 is a wasteful number, since it uses less digits than its factorization.

6216221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 565122.

The product of its digits is 288, while the sum is 20.

The square root of 6216221 is about 2493.2350470824. The cubic root of 6216221 is about 183.8691275580.

The spelling of 6216221 in words is "six million, two hundred sixteen thousand, two hundred twenty-one".