21050128 has 60 divisors (see below), whose sum is σ = 45715824. Its totient is φ = 9380800.

The previous prime is 21050111. The next prime is 21050137. The reversal of 21050128 is 82105012.

It is a super-3 number, since 3×21050128³ (a number of 23 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 160623 + ... + 160753.

Almost surely, 2^21050128 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21050128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22857912).

21050128 is an abundant number, since it is smaller than the sum of its proper divisors (24665696).

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

21050128 is a wasteful number, since it uses less digits than its factorization.

21050128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244 (or 227 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 21050128 is about 4588.0418481091. The cubic root of 21050128 is about 276.1117659785. Note that the first 3 decimals are identical.

The spelling of 21050128 in words is "twenty-one million, fifty thousand, one hundred twenty-eight".