4120021 has 2 divisors, whose sum is σ = 4120022. Its totient is φ = 4120020.

The previous prime is 4120003. The next prime is 4120033. The reversal of 4120021 is 1200214.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3880900 + 239121 = 1970^2 + 489^2 .

It is a cyclic number.

It is not a de Polignac number, because 4120021 - 2⁷ = 4119893 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4120621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2060010 + 2060011.

It is an arithmetic number, because the mean of its divisors is an integer number (2060011).

Almost surely, 2^4120021 is an apocalyptic number.

It is an amenable number.

4120021 is a deficient number, since it is larger than the sum of its proper divisors (1).

4120021 is an equidigital number, since it uses as much as digits as its factorization.

4120021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 4120021 is about 2029.7834859906. The cubic root of 4120021 is about 160.3121640016.

Adding to 4120021 its reverse (1200214), we get a palindrome (5320235).

It can be divided in two parts, 4 and 120021, that multiplied together give a palindrome (480084).

The spelling of 4120021 in words is "four million, one hundred twenty thousand, twenty-one".