221033231 has 4 divisors (see below), whose sum is σ = 223831200. Its totient is φ = 218235264.

The previous prime is 221033177. The next prime is 221033249. The reversal of 221033231 is 132330122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221033231 - 2¹⁸ = 220771087 is a prime.

It is a super-2 number, since 2×221033231² = 97711378412598722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221030231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1398866 + ... + 1399023.

It is an arithmetic number, because the mean of its divisors is an integer number (55957800).

Almost surely, 2^221033231 is an apocalyptic number.

221033231 is a deficient number, since it is larger than the sum of its proper divisors (2797969).

221033231 is an equidigital number, since it uses as much as digits as its factorization.

221033231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2797968.

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

The square root of 221033231 is about 14867.1863847871. The cubic root of 221033231 is about 604.6246616649.

Adding to 221033231 its reverse (132330122), we get a palindrome (353363353).

The spelling of 221033231 in words is "two hundred twenty-one million, thirty-three thousand, two hundred thirty-one".