221433321 has 8 divisors (see below), whose sum is σ = 295464960. Its totient is φ = 147511952.

The previous prime is 221433307. The next prime is 221433323. The reversal of 221433321 is 123334122.

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 221433321 - 2⁶ = 221433257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221433323) 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, 22761 + ... + 30998.

It is an arithmetic number, because the mean of its divisors is an integer number (36933120).

Almost surely, 2^221433321 is an apocalyptic number.

It is an amenable number.

221433321 is a deficient number, since it is larger than the sum of its proper divisors (74031639).

221433321 is a wasteful number, since it uses less digits than its factorization.

221433321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55135.

The product of its digits is 864, while the sum is 21.

The square root of 221433321 is about 14880.6357727081. The cubic root of 221433321 is about 604.9892500879.

Adding to 221433321 its reverse (123334122), we get a palindrome (344767443).

The spelling of 221433321 in words is "two hundred twenty-one million, four hundred thirty-three thousand, three hundred twenty-one".