2716821 has 20 divisors (see below), whose sum is σ = 4299372. Its totient is φ = 1703808.

The previous prime is 2716811. The next prime is 2716823. The reversal of 2716821 is 1286172.

2716821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 1347921 + 1368900 = 1161^2 + 1170^2 .

It is not a de Polignac number, because 2716821 - 2⁵ = 2716789 is a prime.

It is a super-2 number, since 2×2716821² = 14762232692082, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2716823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 391 + ... + 2363.

2^2716821 is an apocalyptic number.

It is an amenable number.

2716821 is a deficient number, since it is larger than the sum of its proper divisors (1582551).

2716821 is a wasteful number, since it uses less digits than its factorization.

2716821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2002 (or 1993 counting only the distinct ones).

The product of its digits is 1344, while the sum is 27.

The square root of 2716821 is about 1648.2781925391. The cubic root of 2716821 is about 139.5362375508.

The spelling of 2716821 in words is "two million, seven hundred sixteen thousand, eight hundred twenty-one".