105231221 has 4 divisors (see below), whose sum is σ = 105258912. Its totient is φ = 105203532.

The previous prime is 105231211. The next prime is 105231281. The reversal of 105231221 is 122132501.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 122132501 = 593 ⋅205957.

It is a cyclic number.

It is not a de Polignac number, because 105231221 - 2¹⁰ = 105230197 is a prime.

It is a super-2 number, since 2×105231221² = 22147219746301682, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 105231221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105231211) 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, 7025 + ... + 16118.

It is an arithmetic number, because the mean of its divisors is an integer number (26314728).

Almost surely, 2^105231221 is an apocalyptic number.

It is an amenable number.

105231221 is a deficient number, since it is larger than the sum of its proper divisors (27691).

105231221 is an equidigital number, since it uses as much as digits as its factorization.

105231221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27690.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 105231221 is about 10258.2269910545. The cubic root of 105231221 is about 472.1154393620.

Adding to 105231221 its reverse (122132501), we get a palindrome (227363722).

The spelling of 105231221 in words is "one hundred five million, two hundred thirty-one thousand, two hundred twenty-one".