221118853 has 2 divisors, whose sum is σ = 221118854. Its totient is φ = 221118852.

The previous prime is 221118829. The next prime is 221118869. The reversal of 221118853 is 358811122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 133471809 + 87647044 = 11553^2 + 9362^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221118853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221118893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110559426 + 110559427.

It is an arithmetic number, because the mean of its divisors is an integer number (110559427).

Almost surely, 2^221118853 is an apocalyptic number.

It is an amenable number.

221118853 is a deficient number, since it is larger than the sum of its proper divisors (1).

221118853 is an equidigital number, since it uses as much as digits as its factorization.

221118853 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3840, while the sum is 31.

The square root of 221118853 is about 14870.0656689875. The cubic root of 221118853 is about 604.7027230638.

Adding to 221118853 its reverse (358811122), we get a palindrome (579929975).

The spelling of 221118853 in words is "two hundred twenty-one million, one hundred eighteen thousand, eight hundred fifty-three".