21448960 has 72 divisors (see below), whose sum is σ = 55371960. Its totient is φ = 7913472.

The previous prime is 21448957. The next prime is 21448961. The reversal of 21448960 is 6984412.

It can be written as a sum of positive squares in 4 ways, for example, as 1806336 + 19642624 = 1344^2 + 4432^2 .

It is not an unprimeable number, because it can be changed into a prime (21448961) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15996 + ... + 17284.

It is an arithmetic number, because the mean of its divisors is an integer number (769055).

Almost surely, 2^21448960 is an apocalyptic number.

21448960 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 21448960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27685980).

21448960 is an abundant number, since it is smaller than the sum of its proper divisors (33923000).

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

21448960 is a wasteful number, since it uses less digits than its factorization.

21448960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1323 (or 1309 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 21448960 is about 4631.3021926884. The cubic root of 21448960 is about 277.8446762724.

The spelling of 21448960 in words is "twenty-one million, four hundred forty-eight thousand, nine hundred sixty".