21101003231320 has 256 divisors, whose sum is σ = 51171432998400. Its totient is φ = 7815424081920.

The previous prime is 21101003231257. The next prime is 21101003231327. The reversal of 21101003231320 is 2313230010112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101003231327) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2476348660 + ... + 2476357180.

It is an arithmetic number, because the mean of its divisors is an integer number (199888410150).

Almost surely, 2^{21101003231320} is an apocalyptic number.

21101003231320 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 21101003231320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25585716499200).

21101003231320 is an abundant number, since it is smaller than the sum of its proper divisors (30070429767080).

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

21101003231320 is a wasteful number, since it uses less digits than its factorization.

21101003231320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9518 (or 9514 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21101003231320 its reverse (2313230010112), we get a palindrome (23414233241432).

The spelling of 21101003231320 in words is "twenty-one trillion, one hundred one billion, three million, two hundred thirty-one thousand, three hundred twenty".