2420821 has 8 divisors (see below), whose sum is σ = 2691584. Its totient is φ = 2162160.

The previous prime is 2420813. The next prime is 2420827. The reversal of 2420821 is 1280242.

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

It is not a de Polignac number, because 2420821 - 2³ = 2420813 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 (2420827) 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, 2601 + ... + 3406.

It is an arithmetic number, because the mean of its divisors is an integer number (336448).

2^2420821 is an apocalyptic number.

It is an amenable number.

2420821 is a deficient number, since it is larger than the sum of its proper divisors (270763).

2420821 is a wasteful number, since it uses less digits than its factorization.

2420821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6051.

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 2420821 is about 1555.8987756278. The cubic root of 2420821 is about 134.2726497346.

The spelling of 2420821 in words is "two million, four hundred twenty thousand, eight hundred twenty-one".