4716821 has 4 divisors (see below), whose sum is σ = 4879500. Its totient is φ = 4554144.

The previous prime is 4716809. The next prime is 4716823. The reversal of 4716821 is 1286174.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1286174 = 2 ⋅643087.

It can be written as a sum of positive squares in 2 ways, for example, as 2280100 + 2436721 = 1510^2 + 1561^2 .

It is a cyclic number.

It is not a de Polignac number, because 4716821 - 2²² = 522517 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 162649 = 4716821 / (4 + 7 + 1 + 6 + 8 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4716823) 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 3 ways as a sum of consecutive naturals, for example, 81296 + ... + 81353.

It is an arithmetic number, because the mean of its divisors is an integer number (1219875).

Almost surely, 2^4716821 is an apocalyptic number.

It is an amenable number.

4716821 is a deficient number, since it is larger than the sum of its proper divisors (162679).

4716821 is a wasteful number, since it uses less digits than its factorization.

4716821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162678.

The product of its digits is 2688, while the sum is 29.

The square root of 4716821 is about 2171.8243483302. The cubic root of 4716821 is about 167.7064625676.

It can be divided in two parts, 47168 and 21, that multiplied together give a triangular number (990528 = T₁₄₀₇).

The spelling of 4716821 in words is "four million, seven hundred sixteen thousand, eight hundred twenty-one".