21100223210020 has 24 divisors (see below), whose sum is σ = 44312707362168. Its totient is φ = 8439662880000.

The previous prime is 21100223209963. The next prime is 21100223210023. The reversal of 21100223210020 is 2001232200112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 15467399424 + 21084755810596 = 124368^2 + 4591814^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21100223209976 and 21100223210003.

It is not an unprimeable number, because it can be changed into a prime (21100223210023) 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, 26244331 + ... + 27036370.

It is an arithmetic number, because the mean of its divisors is an integer number (1846362806757).

Almost surely, 2^{21100223210020} is an apocalyptic number.

21100223210020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21100223210020 is an abundant number, since it is smaller than the sum of its proper divisors (23212484152148).

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

21100223210020 is a wasteful number, since it uses less digits than its factorization.

21100223210020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53300511 (or 53300509 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21100223210020 its reverse (2001232200112), we get a palindrome (23101455410132).

The spelling of 21100223210020 in words is "twenty-one trillion, one hundred billion, two hundred twenty-three million, two hundred ten thousand, twenty".