221106231 has 12 divisors (see below), whose sum is σ = 324143352. Its totient is φ = 145203696.

The previous prime is 221106209. The next prime is 221106239. The reversal of 221106231 is 132601122.

It is not a de Polignac number, because 221106231 - 2¹⁷ = 220975159 is a prime.

It is a super-2 number, since 2×221106231² = 97775930774050722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221106239) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 182736 + ... + 183941.

It is an arithmetic number, because the mean of its divisors is an integer number (27011946).

Almost surely, 2^221106231 is an apocalyptic number.

221106231 is a deficient number, since it is larger than the sum of its proper divisors (103037121).

221106231 is a wasteful number, since it uses less digits than its factorization.

221106231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366750 (or 366747 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 221106231 is about 14869.6412532381. The cubic root of 221106231 is about 604.6912168792.

Adding to 221106231 its reverse (132601122), we get a palindrome (353707353).

The spelling of 221106231 in words is "two hundred twenty-one million, one hundred six thousand, two hundred thirty-one".