21148960 has 96 divisors (see below), whose sum is σ = 59657472. Its totient is φ = 6927360.

The previous prime is 21148927. The next prime is 21148973. The reversal of 21148960 is 6984112.

It is a happy number.

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, 25350 + ... + 26170.

It is an arithmetic number, because the mean of its divisors is an integer number (621432).

Almost surely, 2^21148960 is an apocalyptic number.

21148960 is a gapful number since it is divisible by the number (20) 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 21148960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29828736).

21148960 is an abundant number, since it is smaller than the sum of its proper divisors (38508512).

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

21148960 is a wasteful number, since it uses less digits than its factorization.

21148960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 866 (or 858 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 21148960 is about 4598.7998434374. The cubic root of 21148960 is about 276.5432135784.

The spelling of 21148960 in words is "twenty-one million, one hundred forty-eight thousand, nine hundred sixty".