21528810412 has 24 divisors (see below), whose sum is σ = 38488250304. Its totient is φ = 10532301312.

The previous prime is 21528810389. The next prime is 21528810419. The reversal of 21528810412 is 21401882512.

It is a super-3 number, since 3×21528810412³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21528810419) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 714108 + ... + 743644.

It is an arithmetic number, because the mean of its divisors is an integer number (1603677096).

Almost surely, 2^21528810412 is an apocalyptic number.

It is an amenable number.

21528810412 is a deficient number, since it is larger than the sum of its proper divisors (16959439892).

21528810412 is a wasteful number, since it uses less digits than its factorization.

21528810412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33465 (or 33463 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 34.

The spelling of 21528810412 in words is "twenty-one billion, five hundred twenty-eight million, eight hundred ten thousand, four hundred twelve".