221563241 has 2 divisors, whose sum is σ = 221563242. Its totient is φ = 221563240.

The previous prime is 221563213. The next prime is 221563337. The reversal of 221563241 is 142365122.

It is a happy number.

221563241 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 221563225 + 16 = 14885^2 + 4^2 .

It is a cyclic number.

It is not a de Polignac number, because 221563241 - 2¹⁰ = 221562217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221563241.

It is not a weakly prime, because it can be changed into another prime (221563201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110781620 + 110781621.

It is an arithmetic number, because the mean of its divisors is an integer number (110781621).

Almost surely, 2^221563241 is an apocalyptic number.

It is an amenable number.

221563241 is a deficient number, since it is larger than the sum of its proper divisors (1).

221563241 is an equidigital number, since it uses as much as digits as its factorization.

221563241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 26.

The square root of 221563241 is about 14885.0005374538. Note that the first 3 decimals coincide. The cubic root of 221563241 is about 605.1075473039.

It can be divided in two parts, 2215 and 63241, that added together give a palindrome (65456).

The spelling of 221563241 in words is "two hundred twenty-one million, five hundred sixty-three thousand, two hundred forty-one".