21210214 has 8 divisors (see below), whose sum is σ = 32143608. Its totient is φ = 10495680.

The previous prime is 21210197. The next prime is 21210221. The reversal of 21210214 is 41201212.

It is a happy number.

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 = 21210194 and 21210203.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 54472 + ... + 54859.

It is an arithmetic number, because the mean of its divisors is an integer number (4017951).

Almost surely, 2^21210214 is an apocalyptic number.

21210214 is a deficient number, since it is larger than the sum of its proper divisors (10933394).

21210214 is a wasteful number, since it uses less digits than its factorization.

21210214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109430.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 21210214 is about 4605.4548092452. The cubic root of 21210214 is about 276.8099414357.

Adding to 21210214 its reverse (41201212), we get a palindrome (62411426).

The spelling of 21210214 in words is "twenty-one million, two hundred ten thousand, two hundred fourteen".