21214453 has 16 divisors (see below), whose sum is σ = 24615360.
Its totient is φ = 18107136.
The previous prime is 21214451. The next prime is 21214463. The reversal of 21214453 is 35441212.
It is a cyclic number.
It is not a de Polignac number, because 21214453 - 21 = 21214451 is a prime.
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (21214451) by changing a digit.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12226 + ... + 13852.
It is an arithmetic number, because the mean of its divisors is an integer number (1538460).
Almost surely, 221214453 is an apocalyptic number.
It is an amenable number.
21214453 is a deficient number, since it is larger than the sum of its proper divisors (3400907).
21214453 is a wasteful number, since it uses less digits than its factorization.
21214453 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 1716.
The product of its digits is 960, while the sum is 22.
The square root of 21214453 is about 4605.9150013868.
The cubic root of 21214453 is about 276.8283809665.
Adding to 21214453 its reverse (35441212), we get a palindrome (56655665).
The spelling of 21214453 in words is "twenty-one million, two hundred fourteen thousand, four hundred fifty-three".