21113352 has 128 divisors (see below), whose sum is σ = 64646400. Its totient is φ = 6345216.

The previous prime is 21113329. The next prime is 21113357. The reversal of 21113352 is 25331112.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21113357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 204933 + ... + 205035.

It is an arithmetic number, because the mean of its divisors is an integer number (505050).

Almost surely, 2^21113352 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 21113352, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32323200).

21113352 is an abundant number, since it is smaller than the sum of its proper divisors (43533048).

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

21113352 is a wasteful number, since it uses less digits than its factorization.

21113352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204 (or 194 counting only the distinct ones).

The product of its digits is 180, while the sum is 18.

The square root of 21113352 is about 4594.9267676428. The cubic root of 21113352 is about 276.3879233199.

Adding to 21113352 its reverse (25331112), we get a palindrome (46444464).

The spelling of 21113352 in words is "twenty-one million, one hundred thirteen thousand, three hundred fifty-two".