21448828538944 has 63 divisors (see below), whose sum is σ = 44922027784797. Its totient is φ = 10159637960448.

The previous prime is 21448828538939. The next prime is 21448828538981. The reversal of 21448828538944 is 44983582884412.

The square root of 21448828538944 is 4631288.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 11201659284544 + 10247169254400 = 3346888^2 + 3201120^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 703940542 + ... + 703971010.

Almost surely, 2^{21448828538944} is an apocalyptic number.

21448828538944 is the 4631288-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21448828538944

21448828538944 is an abundant number, since it is smaller than the sum of its proper divisors (23473199245853).

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

21448828538944 is an frugal number, since it uses more digits than its factorization.

21448828538944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60988 (or 30490 counting only the distinct ones).

The product of its digits is 566231040, while the sum is 70.

The spelling of 21448828538944 in words is "twenty-one trillion, four hundred forty-eight billion, eight hundred twenty-eight million, five hundred thirty-eight thousand, nine hundred forty-four".