21148608 has 112 divisors (see below), whose sum is σ = 62158880. Its totient is φ = 6303744.

The previous prime is 21148601. The next prime is 21148667. The reversal of 21148608 is 80684112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21148601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92238 + ... + 92466.

It is an arithmetic number, because the mean of its divisors is an integer number (554990).

Almost surely, 2^21148608 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 21148608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31079440).

21148608 is an abundant number, since it is smaller than the sum of its proper divisors (41010272).

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

21148608 is a wasteful number, since it uses less digits than its factorization.

21148608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294 (or 284 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 21148608 is about 4598.7615724236. The cubic root of 21148608 is about 276.5416793225.

The spelling of 21148608 in words is "twenty-one million, one hundred forty-eight thousand, six hundred eight".