4406021 has 2 divisors, whose sum is σ = 4406022. Its totient is φ = 4406020.

The previous prime is 4405991. The next prime is 4406023. The reversal of 4406021 is 1206044.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2515396 + 1890625 = 1586^2 + 1375^2 .

It is a cyclic number.

It is not a de Polignac number, because 4406021 - 2¹⁸ = 4143877 is a prime.

It is a Sophie Germain prime.

Together with 4406023, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4406023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2203010 + 2203011.

It is an arithmetic number, because the mean of its divisors is an integer number (2203011).

Almost surely, 2^4406021 is an apocalyptic number.

It is an amenable number.

4406021 is a deficient number, since it is larger than the sum of its proper divisors (1).

4406021 is an equidigital number, since it uses as much as digits as its factorization.

4406021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 4406021 is about 2099.0524052534. The cubic root of 4406021 is about 163.9389644974.

The spelling of 4406021 in words is "four million, four hundred six thousand, twenty-one".