4222121 has 4 divisors (see below), whose sum is σ = 4226244. Its totient is φ = 4218000.

The previous prime is 4222117. The next prime is 4222177. The reversal of 4222121 is 1212224.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1466521 + 2755600 = 1211^2 + 1660^2 .

It is a cyclic number.

It is not a de Polignac number, because 4222121 - 2² = 4222117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4222096 and 4222105.

It is not an unprimeable number, because it can be changed into a prime (4222721) 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, 791 + ... + 3011.

It is an arithmetic number, because the mean of its divisors is an integer number (1056561).

Almost surely, 2^4222121 is an apocalyptic number.

It is an amenable number.

4222121 is a deficient number, since it is larger than the sum of its proper divisors (4123).

4222121 is a wasteful number, since it uses less digits than its factorization.

4222121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4122.

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

The square root of 4222121 is about 2054.7800368896. The cubic root of 4222121 is about 161.6256279201.

Adding to 4222121 its reverse (1212224), we get a palindrome (5434345).

The spelling of 4222121 in words is "four million, two hundred twenty-two thousand, one hundred twenty-one".