21214235 has 8 divisors (see below), whose sum is σ = 29093856. Its totient is φ = 14546880.

The previous prime is 21214231. The next prime is 21214247. The reversal of 21214235 is 53241212.

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

It is not a de Polignac number, because 21214235 - 2² = 21214231 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21214231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 303026 + ... + 303095.

It is an arithmetic number, because the mean of its divisors is an integer number (3636732).

Almost surely, 2^21214235 is an apocalyptic number.

21214235 is a deficient number, since it is larger than the sum of its proper divisors (7879621).

21214235 is an equidigital number, since it uses as much as digits as its factorization.

21214235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 606133.

The product of its digits is 480, while the sum is 20.

The square root of 21214235 is about 4605.8913361042. The cubic root of 21214235 is about 276.8274327325.

Adding to 21214235 its reverse (53241212), we get a palindrome (74455447).

The spelling of 21214235 in words is "twenty-one million, two hundred fourteen thousand, two hundred thirty-five".