21146328 has 48 divisors (see below), whose sum is σ = 65454480. Its totient is φ = 6041664.

The previous prime is 21146299. The next prime is 21146329. The reversal of 21146328 is 82364112.

21146328 is a `hidden beast` number, since 21 + 1 + 4 + 632 + 8 = 666.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21146329) 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 11 ways as a sum of consecutive naturals, for example, 20475 + ... + 21482.

It is an arithmetic number, because the mean of its divisors is an integer number (1363635).

Almost surely, 2^21146328 is an apocalyptic number.

21146328 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21146328 is an abundant number, since it is smaller than the sum of its proper divisors (44308152).

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

21146328 is a wasteful number, since it uses less digits than its factorization.

21146328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41976 (or 41969 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 21146328 is about 4598.5136729165. The cubic root of 21146328 is about 276.5317411162.

The spelling of 21146328 in words is "twenty-one million, one hundred forty-six thousand, three hundred twenty-eight".