220344021 has 24 divisors (see below), whose sum is σ = 337633920. Its totient is φ = 137993856.

The previous prime is 220344013. The next prime is 220344041. The reversal of 220344021 is 120443022.

220344021 is a `hidden beast` number, since 2 + 203 + 440 + 21 = 666.

220344021 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 220344021 - 2³ = 220344013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 220343985 and 220344003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220344041) 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, 109006 + ... + 111008.

It is an arithmetic number, because the mean of its divisors is an integer number (14068080).

Almost surely, 2^220344021 is an apocalyptic number.

It is an amenable number.

220344021 is a deficient number, since it is larger than the sum of its proper divisors (117289899).

220344021 is a wasteful number, since it uses less digits than its factorization.

220344021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2745 (or 2742 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 220344021 is about 14843.9893896486. The cubic root of 220344021 is about 603.9955749058.

Adding to 220344021 its reverse (120443022), we get a palindrome (340787043).

Subtracting from 220344021 its reverse (120443022), we obtain a palindrome (99900999).

The spelling of 220344021 in words is "two hundred twenty million, three hundred forty-four thousand, twenty-one".