4121221 has 8 divisors (see below), whose sum is σ = 4511864. Its totient is φ = 3741120.

The previous prime is 4121213. The next prime is 4121231. The reversal of 4121221 is 1221214.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 65025 + 4056196 = 255^2 + 2014^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 4121221 - 2³ = 4121213 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4121231) 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, 1806 + ... + 3391.

It is an arithmetic number, because the mean of its divisors is an integer number (563983).

Almost surely, 2^4121221 is an apocalyptic number.

It is an amenable number.

4121221 is a deficient number, since it is larger than the sum of its proper divisors (390643).

4121221 is a wasteful number, since it uses less digits than its factorization.

4121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5271.

The product of its digits is 32, while the sum is 13.

The square root of 4121221 is about 2030.0790624998. The cubic root of 4121221 is about 160.3277266992.

Adding to 4121221 its reverse (1221214), we get a palindrome (5342435).

The spelling of 4121221 in words is "four million, one hundred twenty-one thousand, two hundred twenty-one".