221121233 has 4 divisors (see below), whose sum is σ = 228254208. Its totient is φ = 213988260.

The previous prime is 221121223. The next prime is 221121253. The reversal of 221121233 is 332121122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221121233 - 2⁴ = 221121217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221121223) 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 in 3 ways as a sum of consecutive naturals, for example, 3566441 + ... + 3566502.

It is an arithmetic number, because the mean of its divisors is an integer number (57063552).

Almost surely, 2^221121233 is an apocalyptic number.

It is an amenable number.

221121233 is a deficient number, since it is larger than the sum of its proper divisors (7132975).

221121233 is an equidigital number, since it uses as much as digits as its factorization.

221121233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7132974.

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

The square root of 221121233 is about 14870.1456953185. The cubic root of 221121233 is about 604.7048926169.

Adding to 221121233 its reverse (332121122), we get a palindrome (553242355).

The spelling of 221121233 in words is "two hundred twenty-one million, one hundred twenty-one thousand, two hundred thirty-three".