21323132 has 12 divisors (see below), whose sum is σ = 37601256. Its totient is φ = 10579920.

The previous prime is 21323129. The next prime is 21323153. The reversal of 21323132 is 23132312.

It is a self number, because there is not a number n which added to its sum of digits gives 21323132.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19823 + ... + 20870.

It is an arithmetic number, because the mean of its divisors is an integer number (3133438).

Almost surely, 2^21323132 is an apocalyptic number.

It is an amenable number.

21323132 is a deficient number, since it is larger than the sum of its proper divisors (16278124).

21323132 is a wasteful number, since it uses less digits than its factorization.

21323132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40828 (or 40826 counting only the distinct ones).

The product of its digits is 216, while the sum is 17.

The square root of 21323132 is about 4617.6976947392. The cubic root of 21323132 is about 277.3002951326.

Adding to 21323132 its reverse (23132312), we get a palindrome (44455444).

The spelling of 21323132 in words is "twenty-one million, three hundred twenty-three thousand, one hundred thirty-two".