221132231 has 4 divisors (see below), whose sum is σ = 221502000. Its totient is φ = 220762464.

The previous prime is 221132167. The next prime is 221132251. The reversal of 221132231 is 132231122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221132231 - 2⁶ = 221132167 is a prime.

It is a super-2 number, since 2×221132231² = 97798927174074722, 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 (221132251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 183986 + ... + 185183.

It is an arithmetic number, because the mean of its divisors is an integer number (55375500).

Almost surely, 2^221132231 is an apocalyptic number.

221132231 is a deficient number, since it is larger than the sum of its proper divisors (369769).

221132231 is an equidigital number, since it uses as much as digits as its factorization.

221132231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369768.

The product of its digits is 144, while the sum is 17.

The square root of 221132231 is about 14870.5154920736. The cubic root of 221132231 is about 604.7149179381.

Adding to 221132231 its reverse (132231122), we get a palindrome (353363353).

The spelling of 221132231 in words is "two hundred twenty-one million, one hundred thirty-two thousand, two hundred thirty-one".