21132424044 has 84 divisors (see below), whose sum is σ = 55754979280. Its totient is φ = 7005048480.

The previous prime is 21132424043. The next prime is 21132424097. The reversal of 21132424044 is 44042423112.

21132424044 is a `hidden beast` number, since 2 + 1 + 13 + 242 + 404 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 21132423999 and 21132424017.

It is not an unprimeable number, because it can be changed into a prime (21132424043) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 507777 + ... + 547815.

Almost surely, 2^21132424044 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 21132424044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27877489640).

21132424044 is an abundant number, since it is smaller than the sum of its proper divisors (34622555236).

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

21132424044 is a wasteful number, since it uses less digits than its factorization.

21132424044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40242 (or 40225 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

Adding to 21132424044 its reverse (44042423112), we get a palindrome (65174847156).

The spelling of 21132424044 in words is "twenty-one billion, one hundred thirty-two million, four hundred twenty-four thousand, forty-four".