21342135 has 16 divisors (see below), whose sum is σ = 34204896. Its totient is φ = 11363328.

The previous prime is 21342119. The next prime is 21342143. The reversal of 21342135 is 53124312.

It is not a de Polignac number, because 21342135 - 2⁴ = 21342119 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15807 + ... + 17103.

It is an arithmetic number, because the mean of its divisors is an integer number (2137806).

Almost surely, 2^21342135 is an apocalyptic number.

21342135 is a deficient number, since it is larger than the sum of its proper divisors (12862761).

21342135 is a wasteful number, since it uses less digits than its factorization.

21342135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2402.

The product of its digits is 720, while the sum is 21.

The square root of 21342135 is about 4619.7548636264. The cubic root of 21342135 is about 277.3826465885.

Adding to 21342135 its reverse (53124312), we get a palindrome (74466447).

The spelling of 21342135 in words is "twenty-one million, three hundred forty-two thousand, one hundred thirty-five".