21304240000 has 160 divisors (see below), whose sum is σ = 53279538840. Its totient is φ = 8482560000.

The previous prime is 21304239889. The next prime is 21304240007. The reversal of 21304240000 is 4240312.

It is a tau number, because it is divible by the number of its divisors (160).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21304240007) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 22639530 + ... + 22640470.

Almost surely, 2^21304240000 is an apocalyptic number.

21304240000 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 21304240000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26639769420).

21304240000 is an abundant number, since it is smaller than the sum of its proper divisors (31975298840).

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

21304240000 is an frugal number, since it uses more digits than its factorization.

21304240000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1258 (or 1231 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

Adding to 21304240000 its reverse (4240312), we get a palindrome (21308480312).

The spelling of 21304240000 in words is "twenty-one billion, three hundred four million, two hundred forty thousand".