21112132 has 6 divisors (see below), whose sum is σ = 36946238. Its totient is φ = 10556064.

The previous prime is 21112127. The next prime is 21112139. The reversal of 21112132 is 23121112.

It can be written as a sum of positive squares in only one way, i.e., 18369796 + 2742336 = 4286^2 + 1656^2 .

It is not an unprimeable number, because it can be changed into a prime (21112139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2639013 + ... + 2639020.

Almost surely, 2^21112132 is an apocalyptic number.

It is an amenable number.

21112132 is a deficient number, since it is larger than the sum of its proper divisors (15834106).

21112132 is a wasteful number, since it uses less digits than its factorization.

21112132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5278037 (or 5278035 counting only the distinct ones).

The product of its digits is 24, while the sum is 13.

The square root of 21112132 is about 4594.7940106168. The cubic root of 21112132 is about 276.3825996783.

Adding to 21112132 its reverse (23121112), we get a palindrome (44233244).

The spelling of 21112132 in words is "twenty-one million, one hundred twelve thousand, one hundred thirty-two".