21449792 has 112 divisors (see below), whose sum is σ = 54620160. Its totient is φ = 8128512.

The previous prime is 21449761. The next prime is 21449797. The reversal of 21449792 is 29794412.

It is a tau number, because it is divible by the number of its divisors (112).

It is not an unprimeable number, because it can be changed into a prime (21449797) 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, 168833 + ... + 168959.

It is an arithmetic number, because the mean of its divisors is an integer number (487680).

Almost surely, 2^21449792 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 21449792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27310080).

21449792 is an abundant number, since it is smaller than the sum of its proper divisors (33170368).

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

21449792 is a wasteful number, since it uses less digits than its factorization.

21449792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188 (or 178 counting only the distinct ones).

The product of its digits is 36288, while the sum is 38.

The square root of 21449792 is about 4631.3920153664. The cubic root of 21449792 is about 277.8482687354.

The spelling of 21449792 in words is "twenty-one million, four hundred forty-nine thousand, seven hundred ninety-two".