21489300000 has 720 divisors, whose sum is σ = 90517331520. Its totient is φ = 4898880000.

The previous prime is 21489299989. The next prime is 21489300013. The reversal of 21489300000 is 398412.

It is a tau number, because it is divible by the number of its divisors (720).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 56699811 + ... + 56700189.

It is an arithmetic number, because the mean of its divisors is an integer number (125718516).

Almost surely, 2^21489300000 is an apocalyptic number.

21489300000 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 21489300000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45258665760).

21489300000 is an abundant number, since it is smaller than the sum of its proper divisors (69028031520).

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

21489300000 is an frugal number, since it uses more digits than its factorization.

21489300000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433 (or 396 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

Adding to 21489300000 its reverse (398412), we get a palindrome (21489698412).

It can be divided in two parts, 21489 and 300000, that added together give a square (321489 = 567²).

The spelling of 21489300000 in words is "twenty-one billion, four hundred eighty-nine million, three hundred thousand".