221023231 has 8 divisors (see below), whose sum is σ = 259663824. Its totient is φ = 185473920.

The previous prime is 221023217. The next prime is 221023241. The reversal of 221023231 is 132320122.

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 221023231 - 2²⁷ = 86805503 is a prime.

It is a super-2 number, since 2×221023231² = 97702537283358722, 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 (221023241) 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, 772666 + ... + 772951.

It is an arithmetic number, because the mean of its divisors is an integer number (32457978).

Almost surely, 2^221023231 is an apocalyptic number.

221023231 is a deficient number, since it is larger than the sum of its proper divisors (38640593).

221023231 is a wasteful number, since it uses less digits than its factorization.

221023231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1545641.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 221023231 is about 14866.8500698702. The cubic root of 221023231 is about 604.6155433712.

Adding to 221023231 its reverse (132320122), we get a palindrome (353343353).

The spelling of 221023231 in words is "two hundred twenty-one million, twenty-three thousand, two hundred thirty-one".