21038128 has 10 divisors (see below), whose sum is σ = 40761404. Its totient is φ = 10519056.

The previous prime is 21038117. The next prime is 21038141. The reversal of 21038128 is 82183012.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 657426 + ... + 657457.

Almost surely, 2^21038128 is an apocalyptic number.

It is an amenable number.

21038128 is a deficient number, since it is larger than the sum of its proper divisors (19723276).

21038128 is a wasteful number, since it uses less digits than its factorization.

21038128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1314891 (or 1314885 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 21038128 is about 4586.7339142357. The cubic root of 21038128 is about 276.0592885304.

The spelling of 21038128 in words is "twenty-one million, thirty-eight thousand, one hundred twenty-eight".