21448696320 has 360 divisors, whose sum is σ = 77196386124. Its totient is φ = 5715173376.

The previous prime is 21448696277. The next prime is 21448696331. The reversal of 21448696320 is 2369684412.

21448696320 is a `hidden beast` number, since 2 + 1 + 4 + 4 + 8 + 6 + 9 + 632 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 21447016704 + 1679616 = 146448^2 + 1296^2 .

It is a tau number, because it is divible by the number of its divisors (360).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 16795522 + ... + 16796798.

Almost surely, 2^21448696320 is an apocalyptic number.

21448696320 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 21448696320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38598193062).

21448696320 is an abundant number, since it is smaller than the sum of its proper divisors (55747689804).

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

21448696320 is an frugal number, since it uses more digits than its factorization.

21448696320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1324 (or 1287 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 45.

The spelling of 21448696320 in words is "twenty-one billion, four hundred forty-eight million, six hundred ninety-six thousand, three hundred twenty".