4052821 has 2 divisors, whose sum is σ = 4052822. Its totient is φ = 4052820.

The previous prime is 4052813. The next prime is 4052849. The reversal of 4052821 is 1282504.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3348900 + 703921 = 1830^2 + 839^2 .

It is a cyclic number.

It is not a de Polignac number, because 4052821 - 2³ = 4052813 is a prime.

4052821 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 4052792 and 4052801.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4052801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2026410 + 2026411.

It is an arithmetic number, because the mean of its divisors is an integer number (2026411).

Almost surely, 2^4052821 is an apocalyptic number.

It is an amenable number.

4052821 is a deficient number, since it is larger than the sum of its proper divisors (1).

4052821 is an equidigital number, since it uses as much as digits as its factorization.

4052821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 4052821 is about 2013.1619408284. The cubic root of 4052821 is about 159.4357861684.

The spelling of 4052821 in words is "four million, fifty-two thousand, eight hundred twenty-one".