4106821 has 2 divisors, whose sum is σ = 4106822. Its totient is φ = 4106820.

The previous prime is 4106819. The next prime is 4106827. The reversal of 4106821 is 1286014.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4056196 + 50625 = 2014^2 + 225^2 .

It is a cyclic number.

It is not a de Polignac number, because 4106821 - 2¹ = 4106819 is a prime.

Together with 4106819, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 4106792 and 4106801.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4106827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2053410 + 2053411.

It is an arithmetic number, because the mean of its divisors is an integer number (2053411).

Almost surely, 2^4106821 is an apocalyptic number.

It is an amenable number.

4106821 is a deficient number, since it is larger than the sum of its proper divisors (1).

4106821 is an equidigital number, since it uses as much as digits as its factorization.

4106821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 4106821 is about 2026.5292990727. The cubic root of 4106821 is about 160.1407745420.

The spelling of 4106821 in words is "four million, one hundred six thousand, eight hundred twenty-one".