21470163 has 16 divisors (see below), whose sum is σ = 33632256. Its totient is φ = 12011040.

The previous prime is 21470149. The next prime is 21470219. The reversal of 21470163 is 36107412.

It is not a de Polignac number, because 21470163 - 2¹⁷ = 21339091 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (21470123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24595 + ... + 25452.

It is an arithmetic number, because the mean of its divisors is an integer number (2102016).

Almost surely, 2^21470163 is an apocalyptic number.

21470163 is a deficient number, since it is larger than the sum of its proper divisors (12162093).

21470163 is a wasteful number, since it uses less digits than its factorization.

21470163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50074.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 21470163 is about 4633.5907242656. The cubic root of 21470163 is about 277.9361989778.

Adding to 21470163 its reverse (36107412), we get a palindrome (57577575).

The spelling of 21470163 in words is "twenty-one million, four hundred seventy thousand, one hundred sixty-three".