21473514828 has 24 divisors (see below), whose sum is σ = 55672075760. Its totient is φ = 7157838240.

The previous prime is 21473514809. The next prime is 21473514851. The reversal of 21473514828 is 82841537412.

21473514828 is a `hidden beast` number, since 214 + 7 + 351 + 4 + 82 + 8 = 666.

It is a super-2 number, since 2×21473514828² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99414313 + ... + 99414528.

Almost surely, 2^21473514828 is an apocalyptic number.

It is an amenable number.

21473514828 is an abundant number, since it is smaller than the sum of its proper divisors (34198560932).

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

21473514828 is a wasteful number, since it uses less digits than its factorization.

21473514828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198828854 (or 198828846 counting only the distinct ones).

The product of its digits is 430080, while the sum is 45.

The spelling of 21473514828 in words is "twenty-one billion, four hundred seventy-three million, five hundred fourteen thousand, eight hundred twenty-eight".