4133221 has 4 divisors (see below), whose sum is σ = 4151500. Its totient is φ = 4114944.

The previous prime is 4133219. The next prime is 4133237. The reversal of 4133221 is 1223314.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1223314 = 2 ⋅611657.

It can be written as a sum of positive squares in 2 ways, for example, as 3724900 + 408321 = 1930^2 + 639^2 .

It is a cyclic number.

It is not a de Polignac number, because 4133221 - 2¹ = 4133219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4133195 and 4133204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4133821) 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, 8796 + ... + 9253.

It is an arithmetic number, because the mean of its divisors is an integer number (1037875).

Almost surely, 2^4133221 is an apocalyptic number.

It is an amenable number.

4133221 is a deficient number, since it is larger than the sum of its proper divisors (18279).

4133221 is a wasteful number, since it uses less digits than its factorization.

4133221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18278.

The product of its digits is 144, while the sum is 16.

The square root of 4133221 is about 2033.0324640792. The cubic root of 4133221 is about 160.4831877784.

Adding to 4133221 its reverse (1223314), we get a palindrome (5356535).

It can be divided in two parts, 4 and 133221, that added together give a square (133225 = 365²).

The spelling of 4133221 in words is "four million, one hundred thirty-three thousand, two hundred twenty-one".