21044744532 has 144 divisors (see below), whose sum is σ = 63301615104. Its totient is φ = 5769792000.

The previous prime is 21044744521. The next prime is 21044744543. The reversal of 21044744532 is 23544744012.

21044744532 is a `hidden beast` number, since 2 + 10 + 44 + 74 + 4 + 532 = 666.

It is an interprime number because it is at equal distance from previous prime (21044744521) and next prime (21044744543).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 613557 + ... + 646947.

Almost surely, 2^21044744532 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 21044744532, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31650807552).

21044744532 is an abundant number, since it is smaller than the sum of its proper divisors (42256870572).

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

21044744532 is a wasteful number, since it uses less digits than its factorization.

21044744532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33510 (or 33505 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 36.

The spelling of 21044744532 in words is "twenty-one billion, forty-four million, seven hundred forty-four thousand, five hundred thirty-two".