4820821 has 8 divisors (see below), whose sum is σ = 4967424. Its totient is φ = 4675680.

The previous prime is 4820807. The next prime is 4820833. The reversal of 4820821 is 1280284.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 4820821 - 2¹¹ = 4818773 is a prime.

It is a super-2 number, since 2×4820821² = 46480630228082, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4820021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12396 + ... + 12778.

It is an arithmetic number, because the mean of its divisors is an integer number (620928).

Almost surely, 2^4820821 is an apocalyptic number.

4820821 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

4820821 is a deficient number, since it is larger than the sum of its proper divisors (146603).

4820821 is a wasteful number, since it uses less digits than its factorization.

4820821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 731.

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 4820821 is about 2195.6368096750. The cubic root of 4820821 is about 168.9300855725.

The spelling of 4820821 in words is "four million, eight hundred twenty thousand, eight hundred twenty-one".