21132496 has 80 divisors (see below), whose sum is σ = 54103680. Its totient is φ = 7741440.

The previous prime is 21132493. The next prime is 21132497. The reversal of 21132496 is 69423112.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21132491) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20440 + ... + 21448.

It is an arithmetic number, because the mean of its divisors is an integer number (676296).

Almost surely, 2^21132496 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21132496, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27051840).

21132496 is an abundant number, since it is smaller than the sum of its proper divisors (32971184).

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

21132496 is a wasteful number, since it uses less digits than its factorization.

21132496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1052 (or 1046 counting only the distinct ones).

The product of its digits is 2592, while the sum is 28.

The square root of 21132496 is about 4597.0094626833. The cubic root of 21132496 is about 276.4714340133.

The spelling of 21132496 in words is "twenty-one million, one hundred thirty-two thousand, four hundred ninety-six".