21520896 has 40 divisors (see below), whose sum is σ = 57337104. Its totient is φ = 7173120.

The previous prime is 21520879. The next prime is 21520897. The reversal of 21520896 is 69802512.

It is not an unprimeable number, because it can be changed into a prime (21520897) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5470 + ... + 8541.

Almost surely, 2^21520896 is an apocalyptic number.

It is an amenable number.

21520896 is an abundant number, since it is smaller than the sum of its proper divisors (35816208).

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

21520896 is an equidigital number, since it uses as much as digits as its factorization.

21520896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14032 (or 14016 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 21520896 is about 4639.0619741495. The cubic root of 21520896 is about 278.1549435589.

The spelling of 21520896 in words is "twenty-one million, five hundred twenty thousand, eight hundred ninety-six".