21543148 has 48 divisors (see below), whose sum is σ = 44198784. Its totient is φ = 9079040.

The previous prime is 21543133. The next prime is 21543173. The reversal of 21543148 is 84134512.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61911 + ... + 62257.

It is an arithmetic number, because the mean of its divisors is an integer number (920808).

Almost surely, 2^21543148 is an apocalyptic number.

It is an amenable number.

21543148 is an abundant number, since it is smaller than the sum of its proper divisors (22655636).

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

21543148 is a wasteful number, since it uses less digits than its factorization.

21543148 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462 (or 460 counting only the distinct ones).

The product of its digits is 3840, while the sum is 28.

The square root of 21543148 is about 4641.4596841942. The cubic root of 21543148 is about 278.2507786606.

It can be divided in two parts, 21 and 543148, that added together give a square (543169 = 737²).

The spelling of 21543148 in words is "twenty-one million, five hundred forty-three thousand, one hundred forty-eight".