21171214 has 8 divisors (see below), whose sum is σ = 31830480. Its totient is φ = 10561056.

The previous prime is 21171203. The next prime is 21171217. The reversal of 21171214 is 41217112.

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

It is a junction number, because it is equal to n+sod(n) for n = 21171191 and 21171200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21171217) 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, 11179 + ... + 12934.

It is an arithmetic number, because the mean of its divisors is an integer number (3978810).

Almost surely, 2^21171214 is an apocalyptic number.

21171214 is a deficient number, since it is larger than the sum of its proper divisors (10659266).

21171214 is a wasteful number, since it uses less digits than its factorization.

21171214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24554.

The product of its digits is 112, while the sum is 19.

The square root of 21171214 is about 4601.2187515918. The cubic root of 21171214 is about 276.6401771384.

Adding to 21171214 its reverse (41217112), we get a palindrome (62388326).

The spelling of 21171214 in words is "twenty-one million, one hundred seventy-one thousand, two hundred fourteen".