21532135 has 8 divisors (see below), whose sum is σ = 26672256. Its totient is φ = 16669920.

The previous prime is 21532097. The next prime is 21532169. The reversal of 21532135 is 53123512.

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

It is not a de Polignac number, because 21532135 - 2⁹ = 21531623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69304 + ... + 69613.

It is an arithmetic number, because the mean of its divisors is an integer number (3334032).

Almost surely, 2^21532135 is an apocalyptic number.

21532135 is a deficient number, since it is larger than the sum of its proper divisors (5140121).

21532135 is a wasteful number, since it uses less digits than its factorization.

21532135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138953.

The product of its digits is 900, while the sum is 22.

The square root of 21532135 is about 4640.2731600629. The cubic root of 21532135 is about 278.2033560315.

Adding to 21532135 its reverse (53123512), we get a palindrome (74655647).

The spelling of 21532135 in words is "twenty-one million, five hundred thirty-two thousand, one hundred thirty-five".