21041744528 has 40 divisors (see below), whose sum is σ = 47675990208. Its totient is φ = 8808170112.

The previous prime is 21041744527. The next prime is 21041744551. The reversal of 21041744528 is 82544714012.

It is a junction number, because it is equal to n+sod(n) for n = 21041744491 and 21041744500.

It is not an unprimeable number, because it can be changed into a prime (21041744527) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2179751 + ... + 2189382.

Almost surely, 2^21041744528 is an apocalyptic number.

21041744528 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21041744528 is an abundant number, since it is smaller than the sum of its proper divisors (26634245680).

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

21041744528 is a wasteful number, since it uses less digits than its factorization.

21041744528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4369191 (or 4369185 counting only the distinct ones).

The product of its (nonzero) digits is 71680, while the sum is 38.

The spelling of 21041744528 in words is "twenty-one billion, forty-one million, seven hundred forty-four thousand, five hundred twenty-eight".