21559048 has 32 divisors (see below), whose sum is σ = 46368000. Its totient is φ = 9205632.

The previous prime is 21559037. The next prime is 21559061. The reversal of 21559048 is 84095512.

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 7 ways as a sum of consecutive naturals, for example, 20028 + ... + 21076.

It is an arithmetic number, because the mean of its divisors is an integer number (1449000).

Almost surely, 2^21559048 is an apocalyptic number.

21559048 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21559048 is an abundant number, since it is smaller than the sum of its proper divisors (24808952).

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

21559048 is a wasteful number, since it uses less digits than its factorization.

21559048 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1429 (or 1425 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 21559048 is about 4643.1721915087. The cubic root of 21559048 is about 278.3192164983.

Subtracting 21559048 from its reverse (84095512), we obtain a square (62536464 = 7908²).

The spelling of 21559048 in words is "twenty-one million, five hundred fifty-nine thousand, forty-eight".