21344132 has 6 divisors (see below), whose sum is σ = 37352238. Its totient is φ = 10672064.

The previous prime is 21344131. The next prime is 21344159. The reversal of 21344132 is 23144312.

It can be written as a sum of positive squares in only one way, i.e., 14032516 + 7311616 = 3746^2 + 2704^2 .

It is not an unprimeable number, because it can be changed into a prime (21344131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2668013 + ... + 2668020.

It is an arithmetic number, because the mean of its divisors is an integer number (6225373).

Almost surely, 2^21344132 is an apocalyptic number.

It is an amenable number.

21344132 is a deficient number, since it is larger than the sum of its proper divisors (16008106).

21344132 is a wasteful number, since it uses less digits than its factorization.

21344132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5336037 (or 5336035 counting only the distinct ones).

The product of its digits is 576, while the sum is 20.

The square root of 21344132 is about 4619.9709955800. The cubic root of 21344132 is about 277.3912979546.

Adding to 21344132 its reverse (23144312), we get a palindrome (44488444).

The spelling of 21344132 in words is "twenty-one million, three hundred forty-four thousand, one hundred thirty-two".