21485008 has 20 divisors (see below), whose sum is σ = 44076420. Its totient is φ = 10110464.

The previous prime is 21484997. The next prime is 21485011. The reversal of 21485008 is 80058412.

It can be written as a sum of positive squares in 2 ways, for example, as 17372224 + 4112784 = 4168^2 + 2028^2 .

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 in 3 ways as a sum of consecutive naturals, for example, 39223 + ... + 39766.

It is an arithmetic number, because the mean of its divisors is an integer number (2203821).

Almost surely, 2^21485008 is an apocalyptic number.

It is an amenable number.

21485008 is an abundant number, since it is smaller than the sum of its proper divisors (22591412).

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

21485008 is a wasteful number, since it uses less digits than its factorization.

21485008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79014 (or 79008 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 28.

The square root of 21485008 is about 4635.1923368939. The cubic root of 21485008 is about 278.0002415332. Note that the first 3 decimals are identical.

The spelling of 21485008 in words is "twenty-one million, four hundred eighty-five thousand, eight".