4053821 has 4 divisors (see below), whose sum is σ = 4267200. Its totient is φ = 3840444.

The previous prime is 4053799. The next prime is 4053851. The reversal of 4053821 is 1283504.

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.

It is a cyclic number.

It is not a de Polignac number, because 4053821 - 2¹⁴ = 4037437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4053851) 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, 106661 + ... + 106698.

It is an arithmetic number, because the mean of its divisors is an integer number (1066800).

Almost surely, 2^4053821 is an apocalyptic number.

It is an amenable number.

4053821 is a deficient number, since it is larger than the sum of its proper divisors (213379).

4053821 is a wasteful number, since it uses less digits than its factorization.

4053821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213378.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 4053821 is about 2013.4102910237. The cubic root of 4053821 is about 159.4488982431.

The spelling of 4053821 in words is "four million, fifty-three thousand, eight hundred twenty-one".