21048885 has 48 divisors (see below), whose sum is σ = 42876288. Its totient is φ = 9417600.

The previous prime is 21048857. The next prime is 21048889. The reversal of 21048885 is 58884012.

It is not a de Polignac number, because 21048885 - 2⁷ = 21048757 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21048889) 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 47 ways as a sum of consecutive naturals, for example, 4800 + ... + 8070.

It is an arithmetic number, because the mean of its divisors is an integer number (893256).

Almost surely, 2^21048885 is an apocalyptic number.

It is an amenable number.

21048885 is an abundant number, since it is smaller than the sum of its proper divisors (21827403).

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

21048885 is a wasteful number, since it uses less digits than its factorization.

21048885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3306 (or 3303 counting only the distinct ones).

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

The square root of 21048885 is about 4587.9063852699. The cubic root of 21048885 is about 276.1063311156.

The spelling of 21048885 in words is "twenty-one million, forty-eight thousand, eight hundred eighty-five".