21541135 has 24 divisors (see below), whose sum is σ = 32807376. Its totient is φ = 13426560.

The previous prime is 21541129. The next prime is 21541183. The reversal of 21541135 is 53114512.

It is a happy number.

It is not a de Polignac number, because 21541135 - 2³ = 21541127 is a prime.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 1302 + ... + 6691.

It is an arithmetic number, because the mean of its divisors is an integer number (1366974).

Almost surely, 2^21541135 is an apocalyptic number.

21541135 is a deficient number, since it is larger than the sum of its proper divisors (11266241).

21541135 is a wasteful number, since it uses less digits than its factorization.

21541135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8023 (or 8016 counting only the distinct ones).

The product of its digits is 600, while the sum is 22.

The square root of 21541135 is about 4641.2428292430. The cubic root of 21541135 is about 278.2421117709.

Adding to 21541135 its reverse (53114512), we get a palindrome (74655647).

The spelling of 21541135 in words is "twenty-one million, five hundred forty-one thousand, one hundred thirty-five".