221545233 has 64 divisors (see below), whose sum is σ = 415045120. Its totient is φ = 113654016.

The previous prime is 221545213. The next prime is 221545243. The reversal of 221545233 is 332545122.

It is a happy number.

It is not a de Polignac number, because 221545233 - 2⁹ = 221544721 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 221545197 and 221545206.

It is not an unprimeable number, because it can be changed into a prime (221545213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 89691 + ... + 92127.

It is an arithmetic number, because the mean of its divisors is an integer number (6485080).

Almost surely, 2^221545233 is an apocalyptic number.

It is an amenable number.

221545233 is a deficient number, since it is larger than the sum of its proper divisors (193499887).

221545233 is a wasteful number, since it uses less digits than its factorization.

221545233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2503 (or 2497 counting only the distinct ones).

The product of its digits is 7200, while the sum is 27.

The square root of 221545233 is about 14884.3956209179. The cubic root of 221545233 is about 605.0911530803.

The spelling of 221545233 in words is "two hundred twenty-one million, five hundred forty-five thousand, two hundred thirty-three".