21125048 has 32 divisors (see below), whose sum is σ = 45746400. Its totient is φ = 8957952.

The previous prime is 21125029. The next prime is 21125057. The reversal of 21125048 is 84052112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3488 + ... + 7376.

It is an arithmetic number, because the mean of its divisors is an integer number (1429575).

Almost surely, 2^21125048 is an apocalyptic number.

21125048 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21125048, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22873200).

21125048 is an abundant number, since it is smaller than the sum of its proper divisors (24621352).

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

21125048 is a wasteful number, since it uses less digits than its factorization.

21125048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3999 (or 3995 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 21125048 is about 4596.1992994212. The cubic root of 21125048 is about 276.4389500575.

The spelling of 21125048 in words is "twenty-one million, one hundred twenty-five thousand, forty-eight".