221210231 has 16 divisors (see below), whose sum is σ = 251004960. Its totient is φ = 193105920.

The previous prime is 221210207. The next prime is 221210243. The reversal of 221210231 is 132012122.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 221210231 - 2⁶ = 221210167 is a prime.

It is a super-2 number, since 2×221210231² = 97867932598146722, 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 (221210281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59771 + ... + 63363.

It is an arithmetic number, because the mean of its divisors is an integer number (15687810).

Almost surely, 2^221210231 is an apocalyptic number.

221210231 is a deficient number, since it is larger than the sum of its proper divisors (29794729).

221210231 is a wasteful number, since it uses less digits than its factorization.

221210231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3826.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 221210231 is about 14873.1379002549. The cubic root of 221210231 is about 604.7860099700.

Adding to 221210231 its reverse (132012122), we get a palindrome (353222353).

The spelling of 221210231 in words is "two hundred twenty-one million, two hundred ten thousand, two hundred thirty-one".