221541233 has 4 divisors (see below), whose sum is σ = 221583588. Its totient is φ = 221498880.

The previous prime is 221541227. The next prime is 221541239. The reversal of 221541233 is 332145122.

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

It is an interprime number because it is at equal distance from previous prime (221541227) and next prime (221541239).

It can be written as a sum of positive squares in 2 ways, for example, as 43665664 + 177875569 = 6608^2 + 13337^2 .

It is a cyclic number.

It is not a de Polignac number, because 221541233 - 2²⁴ = 204764017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221541199 and 221541208.

It is not an unprimeable number, because it can be changed into a prime (221541239) 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, 12008 + ... + 24233.

It is an arithmetic number, because the mean of its divisors is an integer number (55395897).

Almost surely, 2^221541233 is an apocalyptic number.

It is an amenable number.

221541233 is a deficient number, since it is larger than the sum of its proper divisors (42355).

221541233 is an equidigital number, since it uses as much as digits as its factorization.

221541233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42354.

The product of its digits is 1440, while the sum is 23.

The square root of 221541233 is about 14884.2612514024. The cubic root of 221541233 is about 605.0875114174.

Adding to 221541233 its reverse (332145122), we get a palindrome (553686355).

The spelling of 221541233 in words is "two hundred twenty-one million, five hundred forty-one thousand, two hundred thirty-three".