21361548 has 48 divisors (see below), whose sum is σ = 56510720. Its totient is φ = 6225984.

The previous prime is 21361519. The next prime is 21361579. The reversal of 21361548 is 84516312.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 640 + ... + 6567.

Almost surely, 2^21361548 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 21361548, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28255360).

21361548 is an abundant number, since it is smaller than the sum of its proper divisors (35149172).

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

21361548 is a wasteful number, since it uses less digits than its factorization.

21361548 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7246 (or 7244 counting only the distinct ones).

The product of its digits is 5760, while the sum is 30.

The square root of 21361548 is about 4621.8554715612. The cubic root of 21361548 is about 277.4667243600.

The spelling of 21361548 in words is "twenty-one million, three hundred sixty-one thousand, five hundred forty-eight".