4312821 has 4 divisors (see below), whose sum is σ = 5750432. Its totient is φ = 2875212.

The previous prime is 4312811. The next prime is 4312823. The reversal of 4312821 is 1282134.

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 not a de Polignac number, because 4312821 - 2⁹ = 4312309 is a prime.

It is a D-number.

It is a Duffinian number.

4312821 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4312823) 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, 718801 + ... + 718806.

It is an arithmetic number, because the mean of its divisors is an integer number (1437608).

Almost surely, 2^4312821 is an apocalyptic number.

It is an amenable number.

4312821 is a deficient number, since it is larger than the sum of its proper divisors (1437611).

4312821 is a wasteful number, since it uses less digits than its factorization.

4312821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1437610.

The product of its digits is 384, while the sum is 21.

The square root of 4312821 is about 2076.7332520090. The cubic root of 4312821 is about 162.7747902898.

Adding to 4312821 its reverse (1282134), we get a palindrome (5594955).

The spelling of 4312821 in words is "four million, three hundred twelve thousand, eight hundred twenty-one".