21536148 has 12 divisors (see below), whose sum is σ = 50251040. Its totient is φ = 7178712.

The previous prime is 21536147. The next prime is 21536149. The reversal of 21536148 is 84163512.

It is an interprime number because it is at equal distance from previous prime (21536147) and next prime (21536149).

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21536143) 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 3 ways as a sum of consecutive naturals, for example, 897328 + ... + 897351.

Almost surely, 2^21536148 is an apocalyptic number.

It is an amenable number.

21536148 is an abundant number, since it is smaller than the sum of its proper divisors (28714892).

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

21536148 is a wasteful number, since it uses less digits than its factorization.

21536148 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1794686 (or 1794684 counting only the distinct ones).

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

The square root of 21536148 is about 4640.7055498060. The cubic root of 21536148 is about 278.2206381190.

It can be divided in two parts, 215 and 36148, that added together give a palindrome (36363).

The spelling of 21536148 in words is "twenty-one million, five hundred thirty-six thousand, one hundred forty-eight".