21330132 has 24 divisors (see below), whose sum is σ = 49896000. Its totient is φ = 7092096.

The previous prime is 21330119. The next prime is 21330149. The reversal of 21330132 is 23103312.

It is a super-2 number, since 2×21330132² = 909949062274848, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3244 + ... + 7292.

It is an arithmetic number, because the mean of its divisors is an integer number (2079000).

Almost surely, 2^21330132 is an apocalyptic number.

It is an amenable number.

21330132 is an abundant number, since it is smaller than the sum of its proper divisors (28565868).

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

21330132 is a wasteful number, since it uses less digits than its factorization.

21330132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4495 (or 4493 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 21330132 is about 4618.4555860157. The cubic root of 21330132 is about 277.3306360428.

Adding to 21330132 its reverse (23103312), we get a palindrome (44433444).

The spelling of 21330132 in words is "twenty-one million, three hundred thirty thousand, one hundred thirty-two".