221016233 has 2 divisors, whose sum is σ = 221016234. Its totient is φ = 221016232.

The previous prime is 221016203. The next prime is 221016241. The reversal of 221016233 is 332610122.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 204718864 + 16297369 = 14308^2 + 4037^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221016233 is a prime.

It is not a weakly prime, because it can be changed into another prime (221016203) 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, 110508116 + 110508117.

It is an arithmetic number, because the mean of its divisors is an integer number (110508117).

Almost surely, 2^221016233 is an apocalyptic number.

It is an amenable number.

221016233 is a deficient number, since it is larger than the sum of its proper divisors (1).

221016233 is an equidigital number, since it uses as much as digits as its factorization.

221016233 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 221016233 is about 14866.6147121663. The cubic root of 221016233 is about 604.6091622256.

Adding to 221016233 its reverse (332610122), we get a palindrome (553626355).

The spelling of 221016233 in words is "two hundred twenty-one million, sixteen thousand, two hundred thirty-three".