21535214 has 4 divisors (see below), whose sum is σ = 32302824. Its totient is φ = 10767606.

The previous prime is 21535187. The next prime is 21535231. The reversal of 21535214 is 41253512.

It is a semiprime because it is the product of two primes.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 21535214.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5383802 + ... + 5383805.

It is an arithmetic number, because the mean of its divisors is an integer number (8075706).

Almost surely, 2^21535214 is an apocalyptic number.

21535214 is a deficient number, since it is larger than the sum of its proper divisors (10767610).

21535214 is a wasteful number, since it uses less digits than its factorization.

21535214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10767609.

The product of its digits is 1200, while the sum is 23.

The square root of 21535214 is about 4640.6049174650. The cubic root of 21535214 is about 278.2166160157.

Adding to 21535214 its reverse (41253512), we get a palindrome (62788726).

The spelling of 21535214 in words is "twenty-one million, five hundred thirty-five thousand, two hundred fourteen".