4070821 has 2 divisors, whose sum is σ = 4070822. Its totient is φ = 4070820.

The previous prime is 4070819. The next prime is 4070831. The reversal of 4070821 is 1280704.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3381921 + 688900 = 1839^2 + 830^2 .

It is a cyclic number.

It is not a de Polignac number, because 4070821 - 2¹ = 4070819 is a prime.

It is a super-2 number, since 2×4070821² = 33143167228082, which contains 22 as substring.

Together with 4070819, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 4070792 and 4070801.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4070831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2035410 + 2035411.

It is an arithmetic number, because the mean of its divisors is an integer number (2035411).

Almost surely, 2^4070821 is an apocalyptic number.

It is an amenable number.

4070821 is a deficient number, since it is larger than the sum of its proper divisors (1).

4070821 is an equidigital number, since it uses as much as digits as its factorization.

4070821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 4070821 is about 2017.6275672185. The cubic root of 4070821 is about 159.6714743423.

The spelling of 4070821 in words is "four million, seventy thousand, eight hundred twenty-one".