221211233 has 2 divisors, whose sum is σ = 221211234. Its totient is φ = 221211232.

The previous prime is 221211229. The next prime is 221211239. The reversal of 221211233 is 332112122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 217179169 + 4032064 = 14737^2 + 2008^2 .

It is a cyclic number.

It is not a de Polignac number, because 221211233 - 2² = 221211229 is a prime.

It is not a weakly prime, because it can be changed into another prime (221211239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110605616 + 110605617.

It is an arithmetic number, because the mean of its divisors is an integer number (110605617).

Almost surely, 2^221211233 is an apocalyptic number.

It is an amenable number.

221211233 is a deficient number, since it is larger than the sum of its proper divisors (1).

221211233 is an equidigital number, since it uses as much as digits as its factorization.

221211233 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144, while the sum is 17.

The square root of 221211233 is about 14873.1715851058. The cubic root of 221211233 is about 604.7869231204.

Adding to 221211233 its reverse (332112122), we get a palindrome (553323355).

The spelling of 221211233 in words is "two hundred twenty-one million, two hundred eleven thousand, two hundred thirty-three".