21316752 has 60 divisors (see below), whose sum is σ = 60063120. Its totient is φ = 7057344.

The previous prime is 21316751. The next prime is 21316753. The reversal of 21316752 is 25761312.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21316751) and next prime (21316753).

It is not an unprimeable number, because it can be changed into a prime (21316751) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25363 + ... + 26189.

It is an arithmetic number, because the mean of its divisors is an integer number (1001052).

Almost surely, 2^21316752 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 21316752, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30031560).

21316752 is an abundant number, since it is smaller than the sum of its proper divisors (38746368).

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

21316752 is a wasteful number, since it uses less digits than its factorization.

21316752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1020 (or 1011 counting only the distinct ones).

The product of its digits is 2520, while the sum is 27.

The square root of 21316752 is about 4617.0068226070. The cubic root of 21316752 is about 277.2726357756.

The spelling of 21316752 in words is "twenty-one million, three hundred sixteen thousand, seven hundred fifty-two".