56000221 has 2 divisors, whose sum is σ = 56000222. Its totient is φ = 56000220.

The previous prime is 56000213. The next prime is 56000237. The reversal of 56000221 is 12200065.

It is a happy number.

It is an a-pointer prime, because the next prime (56000237) can be obtained adding 56000221 to its sum of digits (16).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37380996 + 18619225 = 6114^2 + 4315^2 .

It is a cyclic number.

It is not a de Polignac number, because 56000221 - 2³ = 56000213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 56000195 and 56000204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56000251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28000110 + 28000111.

It is an arithmetic number, because the mean of its divisors is an integer number (28000111).

Almost surely, 2^56000221 is an apocalyptic number.

It is an amenable number.

56000221 is a deficient number, since it is larger than the sum of its proper divisors (1).

56000221 is an equidigital number, since it uses as much as digits as its factorization.

56000221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 56000221 is about 7483.3295397169. The cubic root of 56000221 is about 382.5867398369.

Adding to 56000221 its reverse (12200065), we get a palindrome (68200286).

The spelling of 56000221 in words is "fifty-six million, two hundred twenty-one", and thus it is an aban number.