21013575584 has 24 divisors (see below), whose sum is σ = 41511691620. Its totient is φ = 10470923776.

The previous prime is 21013575581. The next prime is 21013575593. The reversal of 21013575584 is 48557531012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20785565584 + 228010000 = 144172^2 + 15100^2 .

It is a super-3 number, since 3×21013575584³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21013575581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1111229 + ... + 1129980.

Almost surely, 2^21013575584 is an apocalyptic number.

It is an amenable number.

21013575584 is a deficient number, since it is larger than the sum of its proper divisors (20498116036).

21013575584 is a wasteful number, since it uses less digits than its factorization.

21013575584 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2241512 (or 2241504 counting only the distinct ones).

The product of its (nonzero) digits is 168000, while the sum is 41.

The spelling of 21013575584 in words is "twenty-one billion, thirteen million, five hundred seventy-five thousand, five hundred eighty-four".