21144243300320 has 96 divisors (see below), whose sum is σ = 57091300797888. Its totient is φ = 7249220702208.

The previous prime is 21144243300319. The next prime is 21144243300331. The reversal of 21144243300320 is 2300334244112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36354524 + ... + 36931556.

It is an arithmetic number, because the mean of its divisors is an integer number (594701049978).

Almost surely, 2^{21144243300320} is an apocalyptic number.

21144243300320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21144243300320 is an abundant number, since it is smaller than the sum of its proper divisors (35947057497568).

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

21144243300320 is a wasteful number, since it uses less digits than its factorization.

21144243300320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 609772 (or 609764 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 29.

Adding to 21144243300320 its reverse (2300334244112), we get a palindrome (23444577544432).

The spelling of 21144243300320 in words is "twenty-one trillion, one hundred forty-four billion, two hundred forty-three million, three hundred thousand, three hundred twenty".