21136132 has 24 divisors (see below), whose sum is σ = 39493440. Its totient is φ = 9868320.

The previous prime is 21136127. The next prime is 21136133. The reversal of 21136132 is 23163112.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is not an unprimeable number, because it can be changed into a prime (21136133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3438 + ... + 7354.

It is an arithmetic number, because the mean of its divisors is an integer number (1645560).

Almost surely, 2^21136132 is an apocalyptic number.

It is an amenable number.

21136132 is a deficient number, since it is larger than the sum of its proper divisors (18357308).

21136132 is a wasteful number, since it uses less digits than its factorization.

21136132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4011 (or 4009 counting only the distinct ones).

The product of its digits is 216, while the sum is 19.

The square root of 21136132 is about 4597.4049201696. The cubic root of 21136132 is about 276.4872894126.

Adding to 21136132 its reverse (23163112), we get a palindrome (44299244).

The spelling of 21136132 in words is "twenty-one million, one hundred thirty-six thousand, one hundred thirty-two".