21110170 has 16 divisors (see below), whose sum is σ = 38140488. Its totient is φ = 8412480.

The previous prime is 21110149. The next prime is 21110179. The reversal of 21110170 is 7101112.

21110170 is nontrivially palindromic in base 9.

It can be written as a sum of positive squares in 4 ways, for example, as 17564481 + 3545689 = 4191^2 + 1883^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21110170.

It is not an unprimeable number, because it can be changed into a prime (21110179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1041 + ... + 6580.

Almost surely, 2^21110170 is an apocalyptic number.

21110170 is a deficient number, since it is larger than the sum of its proper divisors (17030318).

21110170 is a wasteful number, since it uses less digits than its factorization.

21110170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7905.

The product of its (nonzero) digits is 14, while the sum is 13.

The square root of 21110170 is about 4594.5805031580. The cubic root of 21110170 is about 276.3740377850.

Adding to 21110170 its reverse (7101112), we get a palindrome (28211282).

The spelling of 21110170 in words is "twenty-one million, one hundred ten thousand, one hundred seventy".