21318294 has 8 divisors (see below), whose sum is σ = 42636600. Its totient is φ = 7106096.

The previous prime is 21318287. The next prime is 21318299. The reversal of 21318294 is 49281312.

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

21318294 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21318299) 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, 1776519 + ... + 1776530.

It is an arithmetic number, because the mean of its divisors is an integer number (5329575).

Almost surely, 2^21318294 is an apocalyptic number.

21318294 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21318294 is a wasteful number, since it uses less digits than its factorization.

21318294 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3553054.

The product of its digits is 3456, while the sum is 30.

The square root of 21318294 is about 4617.1738108934. The cubic root of 21318294 is about 277.2793213485.

It can be divided in two parts, 21318 and 294, that added together give a palindrome (21612).

The spelling of 21318294 in words is "twenty-one million, three hundred eighteen thousand, two hundred ninety-four".