21339528448 has 36 divisors (see below), whose sum is σ = 48680803360. Its totient is φ = 9145511424.

The previous prime is 21339528439. The next prime is 21339528449. The reversal of 21339528448 is 84482593312.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21339528449) 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, 5952318 + ... + 5955901.

Almost surely, 2^21339528448 is an apocalyptic number.

21339528448 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21339528448 is an abundant number, since it is smaller than the sum of its proper divisors (27341274912).

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

21339528448 is an equidigital number, since it uses as much as digits as its factorization.

21339528448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11908242 (or 11908228 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 49.

The spelling of 21339528448 in words is "twenty-one billion, three hundred thirty-nine million, five hundred twenty-eight thousand, four hundred forty-eight".