6652821 has 8 divisors (see below), whose sum is σ = 10137664. Its totient is φ = 3801600.

The previous prime is 6652813. The next prime is 6652823. The reversal of 6652821 is 1282566.

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

It is not a de Polignac number, because 6652821 - 2³ = 6652813 is a prime.

It is a Duffinian number.

6652821 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6652823) 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 7 ways as a sum of consecutive naturals, for example, 158380 + ... + 158421.

It is an arithmetic number, because the mean of its divisors is an integer number (1267208).

Almost surely, 2^6652821 is an apocalyptic number.

It is an amenable number.

6652821 is a deficient number, since it is larger than the sum of its proper divisors (3484843).

6652821 is a wasteful number, since it uses less digits than its factorization.

6652821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316811.

The product of its digits is 5760, while the sum is 30.

The square root of 6652821 is about 2579.3063020898. The cubic root of 6652821 is about 188.0768227607.

It can be divided in two parts, 665 and 2821, that added together give a triangular number (3486 = T₈₃).

The spelling of 6652821 in words is "six million, six hundred fifty-two thousand, eight hundred twenty-one".