21525112 has 48 divisors (see below), whose sum is σ = 48078360. Its totient is φ = 9003456.

The previous prime is 21525109. The next prime is 21525121. The reversal of 21525112 is 21152512.

It is a super-2 number, since 2×21525112² = 926660893225088, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21525112.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16218 + ... + 17494.

Almost surely, 2^21525112 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 21525112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24039180).

21525112 is an abundant number, since it is smaller than the sum of its proper divisors (26553248).

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

21525112 is a wasteful number, since it uses less digits than its factorization.

21525112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1340 (or 1329 counting only the distinct ones).

The product of its digits is 200, while the sum is 19.

The square root of 21525112 is about 4639.5163541042. The cubic root of 21525112 is about 278.1731061340.

Adding to 21525112 its reverse (21152512), we get a palindrome (42677624).

The spelling of 21525112 in words is "twenty-one million, five hundred twenty-five thousand, one hundred twelve".