105512221 has 2 divisors, whose sum is σ = 105512222. Its totient is φ = 105512220.

The previous prime is 105512219. The next prime is 105512243. The reversal of 105512221 is 122215501.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77686596 + 27825625 = 8814^2 + 5275^2 .

It is an emirp because it is prime and its reverse (122215501) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 105512221 - 2¹ = 105512219 is a prime.

It is a super-2 number, since 2×105512221² = 22265657560705682, which contains 22 as substring.

Together with 105512219, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (105512261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52756110 + 52756111.

It is an arithmetic number, because the mean of its divisors is an integer number (52756111).

Almost surely, 2^105512221 is an apocalyptic number.

It is an amenable number.

105512221 is a deficient number, since it is larger than the sum of its proper divisors (1).

105512221 is an equidigital number, since it uses as much as digits as its factorization.

105512221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 105512221 is about 10271.9141838316. The cubic root of 105512221 is about 472.5352974200.

Adding to 105512221 its reverse (122215501), we get a palindrome (227727722).

The spelling of 105512221 in words is "one hundred five million, five hundred twelve thousand, two hundred twenty-one".