21041128 has 16 divisors (see below), whose sum is σ = 39844260. Its totient is φ = 10416000.

The previous prime is 21041117. The next prime is 21041191. The reversal of 21041128 is 82114012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 15194404 + 5846724 = 3898^2 + 2418^2 .

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 3 ways as a sum of consecutive naturals, for example, 12213 + ... + 13828.

Almost surely, 2^21041128 is an apocalyptic number.

It is an amenable number.

21041128 is a deficient number, since it is larger than the sum of its proper divisors (18803132).

21041128 is a wasteful number, since it uses less digits than its factorization.

21041128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26148 (or 26144 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

The square root of 21041128 is about 4587.0609326670. The cubic root of 21041128 is about 276.0724097628.

The spelling of 21041128 in words is "twenty-one million, forty-one thousand, one hundred twenty-eight".