4129221 has 4 divisors (see below), whose sum is σ = 5505632. Its totient is φ = 2752812.

The previous prime is 4129199. The next prime is 4129241. The reversal of 4129221 is 1229214.

4129221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 4129221 - 2⁵ = 4129189 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4129241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 688201 + ... + 688206.

It is an arithmetic number, because the mean of its divisors is an integer number (1376408).

Almost surely, 2^4129221 is an apocalyptic number.

It is an amenable number.

4129221 is a deficient number, since it is larger than the sum of its proper divisors (1376411).

4129221 is a wasteful number, since it uses less digits than its factorization.

4129221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1376410.

The product of its digits is 288, while the sum is 21.

The square root of 4129221 is about 2032.0484738313. The cubic root of 4129221 is about 160.4314008917.

The spelling of 4129221 in words is "four million, one hundred twenty-nine thousand, two hundred twenty-one".