105028221 has 16 divisors (see below), whose sum is σ = 143472384. Its totient is φ = 68311104.

The previous prime is 105028211. The next prime is 105028223. The reversal of 105028221 is 122820501.

It is a happy number.

It is not a de Polignac number, because 105028221 - 2⁹ = 105027709 is a prime.

It is a super-2 number, since 2×105028221² = 22061854412849682, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105028223) 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, 51595 + ... + 53591.

It is an arithmetic number, because the mean of its divisors is an integer number (8967024).

Almost surely, 2^105028221 is an apocalyptic number.

It is an amenable number.

105028221 is a deficient number, since it is larger than the sum of its proper divisors (38444163).

105028221 is a wasteful number, since it uses less digits than its factorization.

105028221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2420.

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 105028221 is about 10248.3277172425. The cubic root of 105028221 is about 471.8116602906.

Adding to 105028221 its reverse (122820501), we get a palindrome (227848722).

The spelling of 105028221 in words is "one hundred five million, twenty-eight thousand, two hundred twenty-one".