21214752 has 96 divisors (see below), whose sum is σ = 60963840. Its totient is φ = 6420480.

The previous prime is 21214751. The next prime is 21214777. The reversal of 21214752 is 25741212.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21214751) 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, 110977 + ... + 111167.

It is an arithmetic number, because the mean of its divisors is an integer number (635040).

Almost surely, 2^21214752 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 21214752, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30481920).

21214752 is an abundant number, since it is smaller than the sum of its proper divisors (39749088).

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

21214752 is a wasteful number, since it uses less digits than its factorization.

21214752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306 (or 298 counting only the distinct ones).

The product of its digits is 1120, while the sum is 24.

The square root of 21214752 is about 4605.9474595353. The cubic root of 21214752 is about 276.8296815153.

Adding to 21214752 its reverse (25741212), we get a palindrome (46955964).

The spelling of 21214752 in words is "twenty-one million, two hundred fourteen thousand, seven hundred fifty-two".