105216406 has 4 divisors (see below), whose sum is σ = 157824612. Its totient is φ = 52608202.

The previous prime is 105216403. The next prime is 105216407. The reversal of 105216406 is 604612501.

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

It is a super-2 number, since 2×105216406² = 22140984183113672, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105216403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26304100 + ... + 26304103.

It is an arithmetic number, because the mean of its divisors is an integer number (39456153).

Almost surely, 2^105216406 is an apocalyptic number.

105216406 is a deficient number, since it is larger than the sum of its proper divisors (52608206).

105216406 is an equidigital number, since it uses as much as digits as its factorization.

105216406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52608205.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 105216406 is about 10257.5048622947. The cubic root of 105216406 is about 472.0932826978.

Adding to 105216406 its reverse (604612501), we get a palindrome (709828907).

The spelling of 105216406 in words is "one hundred five million, two hundred sixteen thousand, four hundred six".