21525896 has 48 divisors (see below), whose sum is σ = 47555100. Its totient is φ = 9106944.

The previous prime is 21525883. The next prime is 21525899. The reversal of 21525896 is 69852512.

It can be written as a sum of positive squares in 2 ways, for example, as 17056900 + 4468996 = 4130^2 + 2114^2 .

It is not an unprimeable number, because it can be changed into a prime (21525899) 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, 34580 + ... + 35196.

Almost surely, 2^21525896 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 21525896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23777550).

21525896 is an abundant number, since it is smaller than the sum of its proper divisors (26029204).

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

21525896 is a wasteful number, since it uses less digits than its factorization.

21525896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 726 (or 715 counting only the distinct ones).

The product of its digits is 43200, while the sum is 38.

The square root of 21525896 is about 4639.6008449003. The cubic root of 21525896 is about 278.1764833533.

The spelling of 21525896 in words is "twenty-one million, five hundred twenty-five thousand, eight hundred ninety-six".