21288673524 has 48 divisors (see below), whose sum is σ = 51458674176. Its totient is φ = 6842841600.

The previous prime is 21288673421. The next prime is 21288673537. The reversal of 21288673524 is 42537688212.

It is a super-2 number, since 2×21288673524² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2704 + ... + 206360.

It is an arithmetic number, because the mean of its divisors is an integer number (1072055712).

Almost surely, 2^21288673524 is an apocalyptic number.

It is an amenable number.

21288673524 is an abundant number, since it is smaller than the sum of its proper divisors (30170000652).

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

21288673524 is a wasteful number, since it uses less digits than its factorization.

21288673524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203976 (or 203974 counting only the distinct ones).

The product of its digits is 1290240, while the sum is 48.

The spelling of 21288673524 in words is "twenty-one billion, two hundred eighty-eight million, six hundred seventy-three thousand, five hundred twenty-four".