21814211 has 4 divisors (see below), whose sum is σ = 21927432. Its totient is φ = 21700992.

The previous prime is 21814187. The next prime is 21814229. The reversal of 21814211 is 11241812.

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

It is a cyclic number.

It is not a de Polignac number, because 21814211 - 2¹⁸ = 21552067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21814231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56321 + ... + 56706.

It is an arithmetic number, because the mean of its divisors is an integer number (5481858).

Almost surely, 2^21814211 is an apocalyptic number.

21814211 is a deficient number, since it is larger than the sum of its proper divisors (113221).

21814211 is a wasteful number, since it uses less digits than its factorization.

21814211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113220.

The product of its digits is 128, while the sum is 20.

The square root of 21814211 is about 4670.5685949357. The cubic root of 21814211 is about 279.4129323881.

The spelling of 21814211 in words is "twenty-one million, eight hundred fourteen thousand, two hundred eleven".