6201221 has 4 divisors (see below), whose sum is σ = 6678252. Its totient is φ = 5724192.

The previous prime is 6201203. The next prime is 6201229. The reversal of 6201221 is 1221026.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1188100 + 5013121 = 1090^2 + 2239^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6201221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6201196 and 6201205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6201229) 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, 238496 + ... + 238521.

It is an arithmetic number, because the mean of its divisors is an integer number (1669563).

Almost surely, 2^6201221 is an apocalyptic number.

It is an amenable number.

6201221 is a deficient number, since it is larger than the sum of its proper divisors (477031).

6201221 is a wasteful number, since it uses less digits than its factorization.

6201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477030.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 6201221 is about 2490.2250902278. The cubic root of 6201221 is about 183.7211138204.

Adding to 6201221 its reverse (1221026), we get a palindrome (7422247).

The spelling of 6201221 in words is "six million, two hundred one thousand, two hundred twenty-one".