21135141 has 8 divisors (see below), whose sum is σ = 31311360. Its totient is φ = 14090076.

The previous prime is 21135119. The next prime is 21135143. The reversal of 21135141 is 14153112.

It is not a de Polignac number, because 21135141 - 2⁵ = 21135109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21135143) by changing a digit.

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, 391365 + ... + 391418.

It is an arithmetic number, because the mean of its divisors is an integer number (3913920).

Almost surely, 2^21135141 is an apocalyptic number.

It is an amenable number.

21135141 is a deficient number, since it is larger than the sum of its proper divisors (10176219).

21135141 is an equidigital number, since it uses as much as digits as its factorization.

21135141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 782792 (or 782786 counting only the distinct ones).

The product of its digits is 120, while the sum is 18.

The square root of 21135141 is about 4597.2971407121. The cubic root of 21135141 is about 276.4829681681.

Adding to 21135141 its reverse (14153112), we get a palindrome (35288253).

The spelling of 21135141 in words is "twenty-one million, one hundred thirty-five thousand, one hundred forty-one".