21541084 has 12 divisors (see below), whose sum is σ = 38997000. Its totient is φ = 10399088.

The previous prime is 21541061. The next prime is 21541097. The reversal of 21541084 is 48014512.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 92734 + ... + 92965.

It is an arithmetic number, because the mean of its divisors is an integer number (3249750).

Almost surely, 2^21541084 is an apocalyptic number.

It is an amenable number.

21541084 is a deficient number, since it is larger than the sum of its proper divisors (17455916).

21541084 is a wasteful number, since it uses less digits than its factorization.

21541084 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185732 (or 185730 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 21541084 is about 4641.2373350218. The cubic root of 21541084 is about 278.2418921854.

Adding to 21541084 its reverse (48014512), we get a palindrome (69555596).

The spelling of 21541084 in words is "twenty-one million, five hundred forty-one thousand, eighty-four".