2818821 has 16 divisors (see below), whose sum is σ = 4190400. Its totient is φ = 1675008.

The previous prime is 2818817. The next prime is 2818841. The reversal of 2818821 is 1288182.

It is not a de Polignac number, because 2818821 - 2² = 2818817 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2818841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 486 + ... + 2423.

It is an arithmetic number, because the mean of its divisors is an integer number (261900).

2^2818821 is an apocalyptic number.

It is an amenable number.

2818821 is a deficient number, since it is larger than the sum of its proper divisors (1371579).

2818821 is a wasteful number, since it uses less digits than its factorization.

2818821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2948.

The product of its digits is 2048, while the sum is 30.

The square root of 2818821 is about 1678.9344835341. The cubic root of 2818821 is about 141.2610725651.

The spelling of 2818821 in words is "two million, eight hundred eighteen thousand, eight hundred twenty-one".