21418135 has 8 divisors (see below), whose sum is σ = 26248896. Its totient is φ = 16769760.

The previous prime is 21418099. The next prime is 21418139. The reversal of 21418135 is 53181412.

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

It is not a de Polignac number, because 21418135 - 2¹⁵ = 21385367 is a prime.

It is a Duffinian number.

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 polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45336 + ... + 45805.

It is an arithmetic number, because the mean of its divisors is an integer number (3281112).

Almost surely, 2^21418135 is an apocalyptic number.

21418135 is a deficient number, since it is larger than the sum of its proper divisors (4830761).

21418135 is an equidigital number, since it uses as much as digits as its factorization.

21418135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91193.

The product of its digits is 960, while the sum is 25.

The square root of 21418135 is about 4627.9730984525. The cubic root of 21418135 is about 277.7115125786.

Adding to 21418135 its reverse (53181412), we get a palindrome (74599547).

The spelling of 21418135 in words is "twenty-one million, four hundred eighteen thousand, one hundred thirty-five".