4212121 has 2 divisors, whose sum is σ = 4212122. Its totient is φ = 4212120.

The previous prime is 4212119. The next prime is 4212127. The reversal of 4212121 is 1212124.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3080025 + 1132096 = 1755^2 + 1064^2 .

It is a cyclic number.

It is not a de Polignac number, because 4212121 - 2¹ = 4212119 is a prime.

Together with 4212119, it forms a pair of twin primes.

4212121 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (4212127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2106060 + 2106061.

It is an arithmetic number, because the mean of its divisors is an integer number (2106061).

Almost surely, 2^4212121 is an apocalyptic number.

It is an amenable number.

4212121 is a deficient number, since it is larger than the sum of its proper divisors (1).

4212121 is an equidigital number, since it uses as much as digits as its factorization.

4212121 is an evil number, because the sum of its binary digits is even.

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

The square root of 4212121 is about 2052.3452438613. The cubic root of 4212121 is about 161.4979248073.

Adding to 4212121 its reverse (1212124), we get a palindrome (5424245).

The spelling of 4212121 in words is "four million, two hundred twelve thousand, one hundred twenty-one".