21101203320320 has 80 divisors (see below), whose sum is σ = 51115014398448. Its totient is φ = 8353465958400.

The previous prime is 21101203320299. The next prime is 21101203320349. The reversal of 21101203320320 is 2302330210112.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 21101203320292 and 21101203320301.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42239606 + ... + 42736245.

Almost surely, 2^{21101203320320} is an apocalyptic number.

21101203320320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21101203320320 is an abundant number, since it is smaller than the sum of its proper divisors (30013811078128).

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

21101203320320 is an frugal number, since it uses more digits than its factorization.

21101203320320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84975971 (or 84975955 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21101203320320 its reverse (2302330210112), we get a palindrome (23403533530432).

The spelling of 21101203320320 in words is "twenty-one trillion, one hundred one billion, two hundred three million, three hundred twenty thousand, three hundred twenty".