21135214 has 8 divisors (see below), whose sum is σ = 32559768. Its totient is φ = 10281960.

The previous prime is 21135173. The next prime is 21135223. The reversal of 21135214 is 41253112.

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 = 21135191 and 21135200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142732 + ... + 142879.

It is an arithmetic number, because the mean of its divisors is an integer number (4069971).

Almost surely, 2^21135214 is an apocalyptic number.

21135214 is a deficient number, since it is larger than the sum of its proper divisors (11424554).

21135214 is a wasteful number, since it uses less digits than its factorization.

21135214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285650.

The product of its digits is 240, while the sum is 19.

The square root of 21135214 is about 4597.3050801529. The cubic root of 21135214 is about 276.4832864884.

Adding to 21135214 its reverse (41253112), we get a palindrome (62388326).

The spelling of 21135214 in words is "twenty-one million, one hundred thirty-five thousand, two hundred fourteen".