21086548 has 12 divisors (see below), whose sum is σ = 42173152. Its totient is φ = 9037080.

The previous prime is 21086543. The next prime is 21086563. The reversal of 21086548 is 84568012.

21086548 is an admirable number.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21086543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 376518 + ... + 376573.

Almost surely, 2^21086548 is an apocalyptic number.

21086548 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21086548 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21086548 is a wasteful number, since it uses less digits than its factorization.

21086548 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 753102 (or 753100 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 34.

The square root of 21086548 is about 4592.0091463324. The cubic root of 21086548 is about 276.2709130172.

The spelling of 21086548 in words is "twenty-one million, eighty-six thousand, five hundred forty-eight".