21485088 has 96 divisors (see below), whose sum is σ = 63645120. Its totient is φ = 7138368.

The previous prime is 21485083. The next prime is 21485089. The reversal of 21485088 is 88058412.

21485088 is a `hidden beast` number, since 2 + 148 + 508 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (21485083) 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 15 ways as a sum of consecutive naturals, for example, 69831 + ... + 70137.

It is an arithmetic number, because the mean of its divisors is an integer number (662970).

Almost surely, 2^21485088 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21485088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31822560).

21485088 is an abundant number, since it is smaller than the sum of its proper divisors (42160032).

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

21485088 is an frugal number, since it uses more digits than its factorization.

21485088 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338 (or 312 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 36.

The square root of 21485088 is about 4635.2009665170. The cubic root of 21485088 is about 278.0005865799. Note that the first 3 decimals are identical.

The spelling of 21485088 in words is "twenty-one million, four hundred eighty-five thousand, eighty-eight".