21166048 has 12 divisors (see below), whose sum is σ = 41670720. Its totient is φ = 10583008.

The previous prime is 21166009. The next prime is 21166051. The reversal of 21166048 is 84066112.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330688 + ... + 330751.

It is an arithmetic number, because the mean of its divisors is an integer number (3472560).

Almost surely, 2^21166048 is an apocalyptic number.

It is an amenable number.

21166048 is a deficient number, since it is larger than the sum of its proper divisors (20504672).

21166048 is an equidigital number, since it uses as much as digits as its factorization.

21166048 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661449 (or 661441 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 21166048 is about 4600.6573443368. The cubic root of 21166048 is about 276.6176742655.

The spelling of 21166048 in words is "twenty-one million, one hundred sixty-six thousand, forty-eight".