21418134 has 16 divisors (see below), whose sum is σ = 42885120. Its totient is φ = 7131240.

The previous prime is 21418099. The next prime is 21418139. The reversal of 21418134 is 43181412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21418139) 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 7 ways as a sum of consecutive naturals, for example, 6279 + ... + 9069.

It is an arithmetic number, because the mean of its divisors is an integer number (2680320).

Almost surely, 2^21418134 is an apocalyptic number.

21418134 is an abundant number, since it is smaller than the sum of its proper divisors (21466986).

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

21418134 is a wasteful number, since it uses less digits than its factorization.

21418134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4075.

The product of its digits is 768, while the sum is 24.

The square root of 21418134 is about 4627.9729904138. The cubic root of 21418134 is about 277.7115082565.

Adding to 21418134 its reverse (43181412), we get a palindrome (64599546).

It can be divided in two parts, 21 and 418134, that added together give a triangular number (418155 = T₉₁₄).

The spelling of 21418134 in words is "twenty-one million, four hundred eighteen thousand, one hundred thirty-four".