21904848 has 120 divisors (see below), whose sum is σ = 72423936. Its totient is φ = 6048000.

The previous prime is 21904843. The next prime is 21904859. The reversal of 21904848 is 84840912.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21904843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30898 + ... + 31598.

Almost surely, 2^21904848 is an apocalyptic number.

21904848 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 21904848, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36211968).

21904848 is an abundant number, since it is smaller than the sum of its proper divisors (50519088).

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

21904848 is a wasteful number, since it uses less digits than its factorization.

21904848 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 753 (or 744 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 21904848 is about 4680.2615311540. The cubic root of 21904848 is about 279.7993800998.

The spelling of 21904848 in words is "twenty-one million, nine hundred four thousand, eight hundred forty-eight".