21242528000 has 144 divisors (see below), whose sum is σ = 53344671744. Its totient is φ = 8428492800.

The previous prime is 21242527963. The next prime is 21242528003. The reversal of 21242528000 is 82524212.

It is not an unprimeable number, because it can be changed into a prime (21242528003) 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, 4061387 + ... + 4066613.

Almost surely, 2^21242528000 is an apocalyptic number.

21242528000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21242528000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26672335872).

21242528000 is an abundant number, since it is smaller than the sum of its proper divisors (32102143744).

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

21242528000 is an equidigital number, since it uses as much as digits as its factorization.

21242528000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5385 (or 5361 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 26.

The spelling of 21242528000 in words is "twenty-one billion, two hundred forty-two million, five hundred twenty-eight thousand".