21302112 has 96 divisors (see below), whose sum is σ = 61175520. Its totient is φ = 6489600.

The previous prime is 21302111. The next prime is 21302123. The reversal of 21302112 is 21120312.

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 (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21302111) 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, 210862 + ... + 210962.

It is an arithmetic number, because the mean of its divisors is an integer number (637245).

Almost surely, 2^21302112 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 21302112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30587760).

21302112 is an abundant number, since it is smaller than the sum of its proper divisors (39873408).

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

21302112 is a wasteful number, since it uses less digits than its factorization.

21302112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153 (or 119 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 21302112 is about 4615.4211075480. The cubic root of 21302112 is about 277.2091457870.

Adding to 21302112 its reverse (21120312), we get a palindrome (42422424).

The spelling of 21302112 in words is "twenty-one million, three hundred two thousand, one hundred twelve".