221250553 has 2 divisors, whose sum is σ = 221250554. Its totient is φ = 221250552.

The previous prime is 221250551. The next prime is 221250571. The reversal of 221250553 is 355052122.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 185286544 + 35964009 = 13612^2 + 5997^2 .

It is a cyclic number.

It is not a de Polignac number, because 221250553 - 2¹ = 221250551 is a prime.

Together with 221250551, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (221250551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110625276 + 110625277.

It is an arithmetic number, because the mean of its divisors is an integer number (110625277).

Almost surely, 2^221250553 is an apocalyptic number.

It is an amenable number.

221250553 is a deficient number, since it is larger than the sum of its proper divisors (1).

221250553 is an equidigital number, since it uses as much as digits as its factorization.

221250553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 221250553 is about 14874.4933695235. The cubic root of 221250553 is about 604.8227543524.

The spelling of 221250553 in words is "two hundred twenty-one million, two hundred fifty thousand, five hundred fifty-three".