4131221 has 8 divisors (see below), whose sum is σ = 4392000. Its totient is φ = 3872448.

The previous prime is 4131109. The next prime is 4131223. The reversal of 4131221 is 1221314.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4131221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4131196 and 4131205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4131223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8030 + ... + 8528.

It is an arithmetic number, because the mean of its divisors is an integer number (549000).

Almost surely, 2^4131221 is an apocalyptic number.

It is an amenable number.

4131221 is a deficient number, since it is larger than the sum of its proper divisors (260779).

4131221 is a wasteful number, since it uses less digits than its factorization.

4131221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1003.

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

The square root of 4131221 is about 2032.5405285012. The cubic root of 4131221 is about 160.4572985136.

Adding to 4131221 its reverse (1221314), we get a palindrome (5352535).

The spelling of 4131221 in words is "four million, one hundred thirty-one thousand, two hundred twenty-one".