21100223203320 has 64 divisors (see below), whose sum is σ = 66052872645120. Its totient is φ = 5382085917824.

The previous prime is 21100223203303. The next prime is 21100223203321. The reversal of 21100223203320 is 2330232200112.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100223203321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3822501444 + ... + 3822506963.

It is an arithmetic number, because the mean of its divisors is an integer number (1032076135080).

Almost surely, 2^{21100223203320} is an apocalyptic number.

21100223203320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21100223203320 is an abundant number, since it is smaller than the sum of its proper divisors (44952649441800).

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

21100223203320 is a wasteful number, since it uses less digits than its factorization.

21100223203320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7645008444 (or 7645008440 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21100223203320 its reverse (2330232200112), we get a palindrome (23430455403432).

The spelling of 21100223203320 in words is "twenty-one trillion, one hundred billion, two hundred twenty-three million, two hundred three thousand, three hundred twenty".