4211021 has 2 divisors, whose sum is σ = 4211022. Its totient is φ = 4211020.

The previous prime is 4210981. The next prime is 4211023. The reversal of 4211021 is 1201124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2220100 + 1990921 = 1490^2 + 1411^2 .

It is a cyclic number.

It is not a de Polignac number, because 4211021 - 2¹⁴ = 4194637 is a prime.

Together with 4211023, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 4210993 and 4211011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4211023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2105510 + 2105511.

It is an arithmetic number, because the mean of its divisors is an integer number (2105511).

Almost surely, 2^4211021 is an apocalyptic number.

It is an amenable number.

4211021 is a deficient number, since it is larger than the sum of its proper divisors (1).

4211021 is an equidigital number, since it uses as much as digits as its factorization.

4211021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 4211021 is about 2052.0772402617. The cubic root of 4211021 is about 161.4838651301.

Adding to 4211021 its reverse (1201124), we get a palindrome (5412145).

The spelling of 4211021 in words is "four million, two hundred eleven thousand, twenty-one".