221231033 has 2 divisors, whose sum is σ = 221231034. Its totient is φ = 221231032.

The previous prime is 221231027. The next prime is 221231069. The reversal of 221231033 is 330132122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 157678249 + 63552784 = 12557^2 + 7972^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221231033 is a prime.

It is not a weakly prime, because it can be changed into another prime (221231233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110615516 + 110615517.

It is an arithmetic number, because the mean of its divisors is an integer number (110615517).

Almost surely, 2^221231033 is an apocalyptic number.

It is an amenable number.

221231033 is a deficient number, since it is larger than the sum of its proper divisors (1).

221231033 is an equidigital number, since it uses as much as digits as its factorization.

221231033 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 221231033 is about 14873.8371982485. The cubic root of 221231033 is about 604.8049668452.

Adding to 221231033 its reverse (330132122), we get a palindrome (551363155).

The spelling of 221231033 in words is "two hundred twenty-one million, two hundred thirty-one thousand, thirty-three".