221343253 has 2 divisors, whose sum is σ = 221343254. Its totient is φ = 221343252.

The previous prime is 221343251. The next prime is 221343259. The reversal of 221343253 is 352343122.

221343253 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., 198894609 + 22448644 = 14103^2 + 4738^2 .

It is a cyclic number.

It is not a de Polignac number, because 221343253 - 2¹ = 221343251 is a prime.

Together with 221343251, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221343251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110671626 + 110671627.

It is an arithmetic number, because the mean of its divisors is an integer number (110671627).

Almost surely, 2^221343253 is an apocalyptic number.

It is an amenable number.

221343253 is a deficient number, since it is larger than the sum of its proper divisors (1).

221343253 is an equidigital number, since it uses as much as digits as its factorization.

221343253 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 25.

The square root of 221343253 is about 14877.6091157148. The cubic root of 221343253 is about 604.9072125078.

Adding to 221343253 its reverse (352343122), we get a palindrome (573686375).

The spelling of 221343253 in words is "two hundred twenty-one million, three hundred forty-three thousand, two hundred fifty-three".