21192128 has 14 divisors (see below), whose sum is σ = 42053256. Its totient is φ = 10596032.

The previous prime is 21192113. The next prime is 21192137. The reversal of 21192128 is 82129112.

It is a junction number, because it is equal to n+sod(n) for n = 21192097 and 21192106.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 165500 + ... + 165627.

It is an arithmetic number, because the mean of its divisors is an integer number (3003804).

Almost surely, 2^21192128 is an apocalyptic number.

It is an amenable number.

21192128 is a deficient number, since it is larger than the sum of its proper divisors (20861128).

21192128 is an equidigital number, since it uses as much as digits as its factorization.

21192128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331139 (or 331129 counting only the distinct ones).

The product of its digits is 576, while the sum is 26.

The square root of 21192128 is about 4603.4908493447. The cubic root of 21192128 is about 276.7312402298.

The spelling of 21192128 in words is "twenty-one million, one hundred ninety-two thousand, one hundred twenty-eight".