21534048 has 36 divisors (see below), whose sum is σ = 61238268. Its totient is φ = 7177920.

The previous prime is 21534047. The next prime is 21534067. The reversal of 21534048 is 84043512.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21534041) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37098 + ... + 37673.

It is an arithmetic number, because the mean of its divisors is an integer number (1701063).

Almost surely, 2^21534048 is an apocalyptic number.

It is an amenable number.

21534048 is an abundant number, since it is smaller than the sum of its proper divisors (39704220).

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

21534048 is a wasteful number, since it uses less digits than its factorization.

21534048 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74787 (or 74776 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 21534048 is about 4640.4792855911. The cubic root of 21534048 is about 278.2115946829.

The spelling of 21534048 in words is "twenty-one million, five hundred thirty-four thousand, forty-eight".