21244520240000 has 320 divisors, whose sum is σ = 53511294716880. Its totient is φ = 8398080000000.

The previous prime is 21244520239997. The next prime is 21244520240033. The reversal of 21244520240000 is 4202544212.

It is a tau number, because it is divible by the number of its divisors (320).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2360235500 + ... + 2360244500.

Almost surely, 2^{21244520240000} is an apocalyptic number.

21244520240000 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 21244520240000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26755647358440).

21244520240000 is an abundant number, since it is smaller than the sum of its proper divisors (32266774476880).

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

21244520240000 is an equidigital number, since it uses as much as digits as its factorization.

21244520240000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9379 (or 9352 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 26.

Adding to 21244520240000 its reverse (4202544212), we get a palindrome (21248722784212).

The spelling of 21244520240000 in words is "twenty-one trillion, two hundred forty-four billion, five hundred twenty million, two hundred forty thousand".