5621821 has 8 divisors (see below), whose sum is σ = 5963904. Its totient is φ = 5287920.

The previous prime is 5621813. The next prime is 5621827. The reversal of 5621821 is 1281265.

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

It is a cyclic number.

It is not a de Polignac number, because 5621821 - 2³ = 5621813 is a prime.

It is a Duffinian number.

5621821 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5621827) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 601 + ... + 3406.

It is an arithmetic number, because the mean of its divisors is an integer number (745488).

Almost surely, 2^5621821 is an apocalyptic number.

It is an amenable number.

5621821 is a deficient number, since it is larger than the sum of its proper divisors (342083).

5621821 is a wasteful number, since it uses less digits than its factorization.

5621821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4091.

The product of its digits is 960, while the sum is 25.

The square root of 5621821 is about 2371.0379583634. The cubic root of 5621821 is about 177.8111556108.

The spelling of 5621821 in words is "five million, six hundred twenty-one thousand, eight hundred twenty-one".