4094021 has 2 divisors, whose sum is σ = 4094022. Its totient is φ = 4094020.

The previous prime is 4094011. The next prime is 4094047. The reversal of 4094021 is 1204904.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2217121 + 1876900 = 1489^2 + 1370^2 .

It is a cyclic number.

It is not a de Polignac number, because 4094021 - 2¹⁰ = 4092997 is a prime.

It is a super-2 number, since 2×4094021² = 33522015896882, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 4093984 and 4094002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4094011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2047010 + 2047011.

It is an arithmetic number, because the mean of its divisors is an integer number (2047011).

Almost surely, 2^4094021 is an apocalyptic number.

It is an amenable number.

4094021 is a deficient number, since it is larger than the sum of its proper divisors (1).

4094021 is an equidigital number, since it uses as much as digits as its factorization.

4094021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 4094021 is about 2023.3687256652. The cubic root of 4094021 is about 159.9742276197.

Adding to 4094021 its reverse (1204904), we get a palindrome (5298925).

The spelling of 4094021 in words is "four million, ninety-four thousand, twenty-one".