21144010128 has 20 divisors (see below), whose sum is σ = 54622026288. Its totient is φ = 7048003360.

The previous prime is 21144010099. The next prime is 21144010177. The reversal of 21144010128 is 82101044112.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 21144010098 and 21144010107.

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 3 ways as a sum of consecutive naturals, for example, 220250058 + ... + 220250153.

Almost surely, 2^21144010128 is an apocalyptic number.

It is an amenable number.

21144010128 is an abundant number, since it is smaller than the sum of its proper divisors (33478016160).

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

21144010128 is a wasteful number, since it uses less digits than its factorization.

21144010128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440500222 (or 440500216 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 24.

The spelling of 21144010128 in words is "twenty-one billion, one hundred forty-four million, ten thousand, one hundred twenty-eight".