21707048 has 32 divisors (see below), whose sum is σ = 44876160. Its totient is φ = 9761280.

The previous prime is 21707041. The next prime is 21707053. The reversal of 21707048 is 84070712.

It is a self number, because there is not a number n which added to its sum of digits gives 21707048.

It is not an unprimeable number, because it can be changed into a prime (21707041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7265 + ... + 9807.

It is an arithmetic number, because the mean of its divisors is an integer number (1402380).

Almost surely, 2^21707048 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 21707048, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22438080).

21707048 is an abundant number, since it is smaller than the sum of its proper divisors (23169112).

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

21707048 is a wasteful number, since it uses less digits than its factorization.

21707048 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2657 (or 2653 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 29.

The square root of 21707048 is about 4659.0823130741. The cubic root of 21707048 is about 278.9546394912.

It can be divided in two parts, 2170704 and 8, that added together give a palindrome (2170712).

The spelling of 21707048 in words is "twenty-one million, seven hundred seven thousand, forty-eight".