21201110320 has 40 divisors (see below), whose sum is σ = 53084321136. Its totient is φ = 7828101888.

The previous prime is 21201110279. The next prime is 21201110321. The reversal of 21201110320 is 2301110212.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a self number, because there is not a number n which added to its sum of digits gives 21201110320.

It is not an unprimeable number, because it can be changed into a prime (21201110321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10191802 + ... + 10193881.

Almost surely, 2^21201110320 is an apocalyptic number.

21201110320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21201110320 is an abundant number, since it is smaller than the sum of its proper divisors (31883210816).

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

21201110320 is a wasteful number, since it uses less digits than its factorization.

21201110320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20385709 (or 20385703 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21201110320 its reverse (2301110212), we get a palindrome (23502220532).

The spelling of 21201110320 in words is "twenty-one billion, two hundred one million, one hundred ten thousand, three hundred twenty".