4160821 has 4 divisors (see below), whose sum is σ = 4755232. Its totient is φ = 3566412.

The previous prime is 4160797. The next prime is 4160843. The reversal of 4160821 is 1280614.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1280614 = 2 ⋅640307.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4160821 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4160792 and 4160801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4160881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 297195 + ... + 297208.

It is an arithmetic number, because the mean of its divisors is an integer number (1188808).

Almost surely, 2^4160821 is an apocalyptic number.

It is an amenable number.

4160821 is a deficient number, since it is larger than the sum of its proper divisors (594411).

4160821 is an equidigital number, since it uses as much as digits as its factorization.

4160821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 594410.

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

The square root of 4160821 is about 2039.8090596916. The cubic root of 4160821 is about 160.8396098266.

The spelling of 4160821 in words is "four million, one hundred sixty thousand, eight hundred twenty-one".