21182135 has 16 divisors (see below), whose sum is σ = 27483456. Its totient is φ = 15579648.

The previous prime is 21182111. The next prime is 21182143. The reversal of 21182135 is 53128112.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21182135 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21182135.

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, 21422 + ... + 22388.

It is an arithmetic number, because the mean of its divisors is an integer number (1717716).

Almost surely, 2^21182135 is an apocalyptic number.

21182135 is a deficient number, since it is larger than the sum of its proper divisors (6301321).

21182135 is a wasteful number, since it uses less digits than its factorization.

21182135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1322.

The product of its digits is 480, while the sum is 23.

The square root of 21182135 is about 4602.4053493798. The cubic root of 21182135 is about 276.6877364964.

The spelling of 21182135 in words is "twenty-one million, one hundred eighty-two thousand, one hundred thirty-five".