105215217 has 8 divisors (see below), whose sum is σ = 147670560. Its totient is φ = 66451680.

The previous prime is 105215213. The next prime is 105215233. The reversal of 105215217 is 712512501.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 105215217 - 2² = 105215213 is a prime.

It is a super-2 number, since 2×105215217² = 22140483776714178, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (105215213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 922884 + ... + 922997.

It is an arithmetic number, because the mean of its divisors is an integer number (18458820).

Almost surely, 2^105215217 is an apocalyptic number.

It is an amenable number.

105215217 is a deficient number, since it is larger than the sum of its proper divisors (42455343).

105215217 is a wasteful number, since it uses less digits than its factorization.

105215217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1845903.

The product of its (nonzero) digits is 700, while the sum is 24.

The square root of 105215217 is about 10257.4469045665. The cubic root of 105215217 is about 472.0915043914.

Adding to 105215217 its reverse (712512501), we get a palindrome (817727718).

The spelling of 105215217 in words is "one hundred five million, two hundred fifteen thousand, two hundred seventeen".