21049845248 has 60 divisors (see below), whose sum is σ = 44302303980. Its totient is φ = 9964200960.

The previous prime is 21049845239. The next prime is 21049845287. The reversal of 21049845248 is 84254894012.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14309153 + ... + 14310623.

It is an arithmetic number, because the mean of its divisors is an integer number (738371733).

Almost surely, 2^21049845248 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 21049845248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22151151990).

21049845248 is an abundant number, since it is smaller than the sum of its proper divisors (23252458732).

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

21049845248 is an frugal number, since it uses more digits than its factorization.

21049845248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2979 (or 1492 counting only the distinct ones).

The product of its (nonzero) digits is 737280, while the sum is 47.

The spelling of 21049845248 in words is "twenty-one billion, forty-nine million, eight hundred forty-five thousand, two hundred forty-eight".