21171314 has 8 divisors (see below), whose sum is σ = 32192220. Its totient is φ = 10440576.

The previous prime is 21171313. The next prime is 21171323. The reversal of 21171314 is 41317112.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20205025 + 966289 = 4495^2 + 983^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21171313) 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, 72359 + ... + 72650.

Almost surely, 2^21171314 is an apocalyptic number.

21171314 is a deficient number, since it is larger than the sum of its proper divisors (11020906).

21171314 is a wasteful number, since it uses less digits than its factorization.

21171314 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145084.

The product of its digits is 168, while the sum is 20.

The square root of 21171314 is about 4601.2296182651. The cubic root of 21171314 is about 276.6406126979.

Adding to 21171314 its reverse (41317112), we get a palindrome (62488426).

The spelling of 21171314 in words is "twenty-one million, one hundred seventy-one thousand, three hundred fourteen".