21143487128 has 32 divisors (see below), whose sum is σ = 42748398000. Its totient is φ = 9771056640.

The previous prime is 21143487091. The next prime is 21143487133. The reversal of 21143487128 is 82178434112.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1690133 + ... + 1702596.

Almost surely, 2^21143487128 is an apocalyptic number.

It is an amenable number.

21143487128 is an abundant number, since it is smaller than the sum of its proper divisors (21604910872).

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

21143487128 is a wasteful number, since it uses less digits than its factorization.

21143487128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3392795 (or 3392791 counting only the distinct ones).

The product of its digits is 86016, while the sum is 41.

The spelling of 21143487128 in words is "twenty-one billion, one hundred forty-three million, four hundred eighty-seven thousand, one hundred twenty-eight".