21238453660800 has 96 divisors (see below), whose sum is σ = 69954156776880. Its totient is φ = 5663587640320.

The previous prime is 21238453660703. The next prime is 21238453660867. The reversal of 21238453660800 is 806635483212.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 21238453660800.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1106159862 + ... + 1106179061.

Almost surely, 2^{21238453660800} is an apocalyptic number.

21238453660800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21238453660800 is an abundant number, since it is smaller than the sum of its proper divisors (48715703116080).

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

21238453660800 is a wasteful number, since it uses less digits than its factorization.

21238453660800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2212338950 (or 2212338933 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 48.

The spelling of 21238453660800 in words is "twenty-one trillion, two hundred thirty-eight billion, four hundred fifty-three million, six hundred sixty thousand, eight hundred".