4152221 has 4 divisors (see below), whose sum is σ = 4157532. Its totient is φ = 4146912.

The previous prime is 4152217. The next prime is 4152229. The reversal of 4152221 is 1222514.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1222514 = 2 ⋅611257.

It can be written as a sum of positive squares in 2 ways, for example, as 3367225 + 784996 = 1835^2 + 886^2 .

It is a cyclic number.

It is not a de Polignac number, because 4152221 - 2² = 4152217 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4152221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4152229) 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, 1226 + ... + 3131.

It is an arithmetic number, because the mean of its divisors is an integer number (1039383).

Almost surely, 2^4152221 is an apocalyptic number.

It is an amenable number.

4152221 is a deficient number, since it is larger than the sum of its proper divisors (5311).

4152221 is an equidigital number, since it uses as much as digits as its factorization.

4152221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5310.

The product of its digits is 160, while the sum is 17.

The square root of 4152221 is about 2037.6999288413. The cubic root of 4152221 is about 160.7287202744.

Adding to 4152221 its reverse (1222514), we get a palindrome (5374735).

The spelling of 4152221 in words is "four million, one hundred fifty-two thousand, two hundred twenty-one".