21114218 has 4 divisors (see below), whose sum is σ = 31671330. Its totient is φ = 10557108.

The previous prime is 21114217. The next prime is 21114229. The reversal of 21114218 is 81241112.

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

It can be written as a sum of positive squares in only one way, i.e., 13786369 + 7327849 = 3713^2 + 2707^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21114218.

It is not an unprimeable number, because it can be changed into a prime (21114211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5278553 + ... + 5278556.

Almost surely, 2^21114218 is an apocalyptic number.

21114218 is a deficient number, since it is larger than the sum of its proper divisors (10557112).

21114218 is a wasteful number, since it uses less digits than its factorization.

21114218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10557111.

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

The square root of 21114218 is about 4595.0210010401. The cubic root of 21114218 is about 276.3917021083.

The spelling of 21114218 in words is "twenty-one million, one hundred fourteen thousand, two hundred eighteen".