105121271 has 4 divisors (see below), whose sum is σ = 106452000. Its totient is φ = 103790544.

The previous prime is 105121267. The next prime is 105121273. The reversal of 105121271 is 172121501.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 105121271 - 2² = 105121267 is a prime.

It is a super-2 number, since 2×105121271² = 22100963233310882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105121273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 665246 + ... + 665403.

It is an arithmetic number, because the mean of its divisors is an integer number (26613000).

Almost surely, 2^105121271 is an apocalyptic number.

105121271 is a deficient number, since it is larger than the sum of its proper divisors (1330729).

105121271 is an equidigital number, since it uses as much as digits as its factorization.

105121271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1330728.

The product of its (nonzero) digits is 140, while the sum is 20.

The square root of 105121271 is about 10252.8664772345. The cubic root of 105121271 is about 471.9509533806.

Adding to 105121271 its reverse (172121501), we get a palindrome (277242772).

It can be divided in two parts, 1051 and 21271, that added together give a palindrome (22322).

The spelling of 105121271 in words is "one hundred five million, one hundred twenty-one thousand, two hundred seventy-one".