21343132 has 12 divisors (see below), whose sum is σ = 37983960. Its totient is φ = 10490576.

The previous prime is 21343129. The next prime is 21343139. The reversal of 21343132 is 23134312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21343139) 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 3 ways as a sum of consecutive naturals, for example, 44983 + ... + 45454.

It is an arithmetic number, because the mean of its divisors is an integer number (3165330).

Almost surely, 2^21343132 is an apocalyptic number.

It is an amenable number.

21343132 is a deficient number, since it is larger than the sum of its proper divisors (16640828).

21343132 is a wasteful number, since it uses less digits than its factorization.

21343132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90500 (or 90498 counting only the distinct ones).

The product of its digits is 432, while the sum is 19.

The square root of 21343132 is about 4619.8627685246. The cubic root of 21343132 is about 277.3869658408.

Adding to 21343132 its reverse (23134312), we get a palindrome (44477444).

The spelling of 21343132 in words is "twenty-one million, three hundred forty-three thousand, one hundred thirty-two".