21464218 has 8 divisors (see below), whose sum is σ = 33066612. Its totient is φ = 10442016.

The previous prime is 21464213. The next prime is 21464227. The reversal of 21464218 is 81246412.

It can be written as a sum of positive squares in 2 ways, for example, as 19740249 + 1723969 = 4443^2 + 1313^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21464213) 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 in 3 ways as a sum of consecutive naturals, for example, 144955 + ... + 145102.

Almost surely, 2^21464218 is an apocalyptic number.

21464218 is a deficient number, since it is larger than the sum of its proper divisors (11602394).

21464218 is a wasteful number, since it uses less digits than its factorization.

21464218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290096.

The product of its digits is 3072, while the sum is 28.

The square root of 21464218 is about 4632.9491687261. The cubic root of 21464218 is about 277.9105434788.

The spelling of 21464218 in words is "twenty-one million, four hundred sixty-four thousand, two hundred eighteen".