21264048 has 120 divisors (see below), whose sum is σ = 66033968. Its totient is φ = 6345216.

The previous prime is 21264037. The next prime is 21264053. The reversal of 21264048 is 84046212.

21264048 is a `hidden beast` number, since 2 + 12 + 640 + 4 + 8 = 666.

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 23 ways as a sum of consecutive naturals, for example, 69111 + ... + 69417.

Almost surely, 2^21264048 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 21264048, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33016984).

21264048 is an abundant number, since it is smaller than the sum of its proper divisors (44769920).

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

21264048 is a wasteful number, since it uses less digits than its factorization.

21264048 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371 (or 362 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 21264048 is about 4611.2956964393. The cubic root of 21264048 is about 277.0439355646.

The spelling of 21264048 in words is "twenty-one million, two hundred sixty-four thousand, forty-eight".