4212221 has 8 divisors (see below), whose sum is σ = 4693080. Its totient is φ = 3753792.

The previous prime is 4212211. The next prime is 4212227. The reversal of 4212221 is 1222124.

It can be written as a sum of positive squares in 4 ways, for example, as 156025 + 4056196 = 395^2 + 2014^2 .

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-4212221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 4212196 and 4212205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4212227) 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 7 ways as a sum of consecutive naturals, for example, 5210 + ... + 5963.

It is an arithmetic number, because the mean of its divisors is an integer number (586635).

Almost surely, 2^4212221 is an apocalyptic number.

It is an amenable number.

4212221 is a deficient number, since it is larger than the sum of its proper divisors (480859).

4212221 is a wasteful number, since it uses less digits than its factorization.

4212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11215.

The product of its digits is 64, while the sum is 14.

The square root of 4212221 is about 2052.3696060895. The cubic root of 4212221 is about 161.4992028384.

Adding to 4212221 its reverse (1222124), we get a palindrome (5434345).

The spelling of 4212221 in words is "four million, two hundred twelve thousand, two hundred twenty-one".