2812821 has 8 divisors (see below), whose sum is σ = 4091424. Its totient is φ = 1704720.

The previous prime is 2812819. The next prime is 2812829. The reversal of 2812821 is 1282182.

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

It is not a de Polignac number, because 2812821 - 2¹ = 2812819 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2812791 and 2812800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2812829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42586 + ... + 42651.

It is an arithmetic number, because the mean of its divisors is an integer number (511428).

2^2812821 is an apocalyptic number.

It is an amenable number.

2812821 is a deficient number, since it is larger than the sum of its proper divisors (1278603).

2812821 is a wasteful number, since it uses less digits than its factorization.

2812821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85251.

The product of its digits is 512, while the sum is 24.

The square root of 2812821 is about 1677.1466841037. The cubic root of 2812821 is about 141.1607743068.

The spelling of 2812821 in words is "two million, eight hundred twelve thousand, eight hundred twenty-one".