2402821 has 4 divisors (see below), whose sum is σ = 2438752. Its totient is φ = 2366892.

The previous prime is 2402819. The next prime is 2402837. The reversal of 2402821 is 1282042.

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 2402821 - 2¹ = 2402819 is a prime.

It is a Duffinian number.

2402821 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2402921) 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, 17865 + ... + 17998.

It is an arithmetic number, because the mean of its divisors is an integer number (609688).

2^2402821 is an apocalyptic number.

It is an amenable number.

2402821 is a deficient number, since it is larger than the sum of its proper divisors (35931).

2402821 is an equidigital number, since it uses as much as digits as its factorization.

2402821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35930.

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

The square root of 2402821 is about 1550.1035449285. The cubic root of 2402821 is about 133.9390269865.

Adding to 2402821 its reverse (1282042), we get a palindrome (3684863).

It can be divided in two parts, 2402 and 821, that added together give a palindrome (3223).

The spelling of 2402821 in words is "two million, four hundred two thousand, eight hundred twenty-one".