105510221 has 2 divisors, whose sum is σ = 105510222. Its totient is φ = 105510220.

The previous prime is 105510217. The next prime is 105510233. The reversal of 105510221 is 122015501.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 103754596 + 1755625 = 10186^2 + 1325^2 .

It is a cyclic number.

It is not a de Polignac number, because 105510221 - 2² = 105510217 is a prime.

It is a super-2 number, since 2×105510221² = 22264813470937682, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 105510221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (105510271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52755110 + 52755111.

It is an arithmetic number, because the mean of its divisors is an integer number (52755111).

Almost surely, 2^105510221 is an apocalyptic number.

It is an amenable number.

105510221 is a deficient number, since it is larger than the sum of its proper divisors (1).

105510221 is an equidigital number, since it uses as much as digits as its factorization.

105510221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 100, while the sum is 17.

The square root of 105510221 is about 10271.8168305320. The cubic root of 105510221 is about 472.5323117420.

Adding to 105510221 its reverse (122015501), we get a palindrome (227525722).

The spelling of 105510221 in words is "one hundred five million, five hundred ten thousand, two hundred twenty-one".