105120217 has 4 divisors (see below), whose sum is σ = 110652880. Its totient is φ = 99587556.

The previous prime is 105120203. The next prime is 105120221. The reversal of 105120217 is 712021501.

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.

It is a cyclic number.

It is not a de Polignac number, because 105120217 - 2¹⁵ = 105087449 is a prime.

It is a super-2 number, since 2×105120217² = 22100520044254178, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 5532643 = 105120217 / (1 + 0 + 5 + 1 + 2 + 0 + 2 + 1 + 7).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 105120194 and 105120203.

It is not an unprimeable number, because it can be changed into a prime (105120227) 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, 2766303 + ... + 2766340.

It is an arithmetic number, because the mean of its divisors is an integer number (27663220).

Almost surely, 2^105120217 is an apocalyptic number.

It is an amenable number.

105120217 is a deficient number, since it is larger than the sum of its proper divisors (5532663).

105120217 is an equidigital number, since it uses as much as digits as its factorization.

105120217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5532662.

The product of its (nonzero) digits is 140, while the sum is 19.

The square root of 105120217 is about 10252.8150768460. The cubic root of 105120217 is about 471.9493760342.

Adding to 105120217 its reverse (712021501), we get a palindrome (817141718).

The spelling of 105120217 in words is "one hundred five million, one hundred twenty thousand, two hundred seventeen".