221421233 has 8 divisors (see below), whose sum is σ = 247168416. Its totient is φ = 196610400.

The previous prime is 221421173. The next prime is 221421241. The reversal of 221421233 is 332124122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221421233 - 2⁶ = 221421169 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221421133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 233588 + ... + 234533.

It is an arithmetic number, because the mean of its divisors is an integer number (30896052).

Almost surely, 2^221421233 is an apocalyptic number.

It is an amenable number.

221421233 is a deficient number, since it is larger than the sum of its proper divisors (25747183).

221421233 is a wasteful number, since it uses less digits than its factorization.

221421233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 468175.

The product of its digits is 576, while the sum is 20.

The square root of 221421233 is about 14880.2296017232. The cubic root of 221421233 is about 604.9782411408.

Adding to 221421233 its reverse (332124122), we get a palindrome (553545355).

The spelling of 221421233 in words is "two hundred twenty-one million, four hundred twenty-one thousand, two hundred thirty-three".