21035128 has 16 divisors (see below), whose sum is σ = 41517000. Its totient is φ = 9963936.

The previous prime is 21035123. The next prime is 21035149. The reversal of 21035128 is 82153012.

It is a junction number, because it is equal to n+sod(n) for n = 21035099 and 21035108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21035123) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 69043 + ... + 69346.

Almost surely, 2^21035128 is an apocalyptic number.

It is an amenable number.

21035128 is a deficient number, since it is larger than the sum of its proper divisors (20481872).

21035128 is a wasteful number, since it uses less digits than its factorization.

21035128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138414 (or 138410 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 21035128 is about 4586.4068724874. The cubic root of 21035128 is about 276.0461660505.

The spelling of 21035128 in words is "twenty-one million, thirty-five thousand, one hundred twenty-eight".