21118332 has 24 divisors (see below), whose sum is σ = 50423296. Its totient is φ = 6875568.

The previous prime is 21118303. The next prime is 21118337. The reversal of 21118332 is 23381112.

It is a junction number, because it is equal to n+sod(n) for n = 21118299 and 21118308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21118337) 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, 19948 + ... + 20979.

Almost surely, 2^21118332 is an apocalyptic number.

It is an amenable number.

21118332 is an abundant number, since it is smaller than the sum of its proper divisors (29304964).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21118332 is a wasteful number, since it uses less digits than its factorization.

21118332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40977 (or 40975 counting only the distinct ones).

The product of its digits is 288, while the sum is 21.

The square root of 21118332 is about 4595.4686376908. The cubic root of 21118332 is about 276.4096521238.

Adding to 21118332 its reverse (23381112), we get a palindrome (44499444).

The spelling of 21118332 in words is "twenty-one million, one hundred eighteen thousand, three hundred thirty-two".