21136041 has 24 divisors (see below), whose sum is σ = 32273280. Its totient is φ = 13307616.

The previous prime is 21136039. The next prime is 21136067. The reversal of 21136041 is 14063112.

It is a happy number.

It is not a de Polignac number, because 21136041 - 2¹ = 21136039 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21136441) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11406 + ... + 13128.

It is an arithmetic number, because the mean of its divisors is an integer number (1344720).

Almost surely, 2^21136041 is an apocalyptic number.

It is an amenable number.

21136041 is a deficient number, since it is larger than the sum of its proper divisors (11137239).

21136041 is a wasteful number, since it uses less digits than its factorization.

21136041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1805 (or 1802 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 21136041 is about 4597.3950232713. The cubic root of 21136041 is about 276.4868926138.

Adding to 21136041 its reverse (14063112), we get a palindrome (35199153).

The spelling of 21136041 in words is "twenty-one million, one hundred thirty-six thousand, forty-one".