221845153 has 2 divisors, whose sum is σ = 221845154. Its totient is φ = 221845152.

The previous prime is 221845147. The next prime is 221845171. The reversal of 221845153 is 351548122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 196925089 + 24920064 = 14033^2 + 4992^2 .

It is a cyclic number.

It is not a de Polignac number, because 221845153 - 2¹⁷ = 221714081 is a prime.

It is not a weakly prime, because it can be changed into another prime (221840153) 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, 110922576 + 110922577.

It is an arithmetic number, because the mean of its divisors is an integer number (110922577).

Almost surely, 2^221845153 is an apocalyptic number.

It is an amenable number.

221845153 is a deficient number, since it is larger than the sum of its proper divisors (1).

221845153 is an equidigital number, since it uses as much as digits as its factorization.

221845153 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9600, while the sum is 31.

The square root of 221845153 is about 14894.4671942302. The cubic root of 221845153 is about 605.3640801999.

The spelling of 221845153 in words is "two hundred twenty-one million, eight hundred forty-five thousand, one hundred fifty-three".