220005621 has 24 divisors (see below), whose sum is σ = 348064704. Its totient is φ = 132802560.

The previous prime is 220005601. The next prime is 220005623. The reversal of 220005621 is 126500022.

220005621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 220005621 - 2¹⁰ = 220004597 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 220005594 and 220005603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220005623) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21120 + ... + 29766.

It is an arithmetic number, because the mean of its divisors is an integer number (14502696).

Almost surely, 2^220005621 is an apocalyptic number.

It is an amenable number.

220005621 is a deficient number, since it is larger than the sum of its proper divisors (128059083).

220005621 is a wasteful number, since it uses less digits than its factorization.

220005621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8921 (or 8918 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 220005621 is about 14832.5864568524. The cubic root of 220005621 is about 603.6862149865.

Adding to 220005621 its reverse (126500022), we get a palindrome (346505643).

The spelling of 220005621 in words is "two hundred twenty million, five thousand, six hundred twenty-one".