21451752 has 96 divisors (see below), whose sum is σ = 68590080. Its totient is φ = 5927040.

The previous prime is 21451723. The next prime is 21451753. The reversal of 21451752 is 25715412.

It is not an unprimeable number, because it can be changed into a prime (21451753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14938 + ... + 16310.

It is an arithmetic number, because the mean of its divisors is an integer number (714480).

Almost surely, 2^21451752 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 21451752, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34295040).

21451752 is an abundant number, since it is smaller than the sum of its proper divisors (47138328).

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

21451752 is a wasteful number, since it uses less digits than its factorization.

21451752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1423 (or 1416 counting only the distinct ones).

The product of its digits is 2800, while the sum is 27.

The square root of 21451752 is about 4631.6036099822. The cubic root of 21451752 is about 277.8567313818.

The spelling of 21451752 in words is "twenty-one million, four hundred fifty-one thousand, seven hundred fifty-two".