21299148 has 72 divisors (see below), whose sum is σ = 58889376. Its totient is φ = 6451200.

The previous prime is 21299143. The next prime is 21299149. The reversal of 21299148 is 84199212.

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

It is not an unprimeable number, because it can be changed into a prime (21299141) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32908 + ... + 33548.

It is an arithmetic number, because the mean of its divisors is an integer number (817908).

Almost surely, 2^21299148 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 21299148, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29444688).

21299148 is an abundant number, since it is smaller than the sum of its proper divisors (37590228).

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

21299148 is a wasteful number, since it uses less digits than its factorization.

21299148 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 735 (or 730 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 21299148 is about 4615.0999989166. The cubic root of 21299148 is about 277.1962881258.

The spelling of 21299148 in words is "twenty-one million, two hundred ninety-nine thousand, one hundred forty-eight".