56530221 has 16 divisors (see below), whose sum is σ = 83220480. Its totient is φ = 33846320.

The previous prime is 56530217. The next prime is 56530231. The reversal of 56530221 is 12203565.

It is a cyclic number.

It is not a de Polignac number, because 56530221 - 2² = 56530217 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 56530191 and 56530200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56530231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7581 + ... + 13058.

It is an arithmetic number, because the mean of its divisors is an integer number (5201280).

Almost surely, 2^56530221 is an apocalyptic number.

It is an amenable number.

56530221 is a deficient number, since it is larger than the sum of its proper divisors (26690259).

56530221 is a wasteful number, since it uses less digits than its factorization.

56530221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20736.

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 56530221 is about 7518.6581914594. The cubic root of 56530221 is about 383.7899173676.

Adding to 56530221 its reverse (12203565), we get a palindrome (68733786).

The spelling of 56530221 in words is "fifty-six million, five hundred thirty thousand, two hundred twenty-one".