6215221 has 12 divisors (see below), whose sum is σ = 6724480. Its totient is φ = 5738040.

The previous prime is 6215213. The next prime is 6215227. The reversal of 6215221 is 1225126.

It is not a de Polignac number, because 6215221 - 2³ = 6215213 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 (6215227) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16210 + ... + 16588.

Almost surely, 2^6215221 is an apocalyptic number.

It is an amenable number.

6215221 is a deficient number, since it is larger than the sum of its proper divisors (509259).

6215221 is a wasteful number, since it uses less digits than its factorization.

6215221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456 (or 433 counting only the distinct ones).

The product of its digits is 240, while the sum is 19.

The square root of 6215221 is about 2493.0344963518. The cubic root of 6215221 is about 183.8592673879.

The spelling of 6215221 in words is "six million, two hundred fifteen thousand, two hundred twenty-one".