221333231 has 8 divisors (see below), whose sum is σ = 253211040. Its totient is φ = 189520128.

The previous prime is 221333219. The next prime is 221333237. The reversal of 221333231 is 132333122.

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

It is not a de Polignac number, because 221333231 - 2²² = 217138927 is a prime.

It is a super-2 number, since 2×221333231² = 97976798289798722, 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 (221333237) 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, 8606 + ... + 22731.

It is an arithmetic number, because the mean of its divisors is an integer number (31651380).

Almost surely, 2^221333231 is an apocalyptic number.

221333231 is a deficient number, since it is larger than the sum of its proper divisors (31877809).

221333231 is a wasteful number, since it uses less digits than its factorization.

221333231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32353.

The product of its digits is 648, while the sum is 20.

The square root of 221333231 is about 14877.2722970308. The cubic root of 221333231 is about 604.8980826887.

Adding to 221333231 its reverse (132333122), we get a palindrome (353666353).

The spelling of 221333231 in words is "two hundred twenty-one million, three hundred thirty-three thousand, two hundred thirty-one".