21100122212020 has 24 divisors (see below), whose sum is σ = 45036654297768. Its totient is φ = 8301687427200.

The previous prime is 21100122212011. The next prime is 21100122212021. The reversal of 21100122212020 is 2021222100112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 593969241636 + 20506152970384 = 770694^2 + 4528372^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21100122211985 and 21100122212003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100122212021) by changing a digit.

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, 8647589851 + ... + 8647592290.

It is an arithmetic number, because the mean of its divisors is an integer number (1876527262407).

Almost surely, 2^{21100122212020} is an apocalyptic number.

21100122212020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21100122212020 is an abundant number, since it is smaller than the sum of its proper divisors (23936532085748).

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

21100122212020 is a wasteful number, since it uses less digits than its factorization.

21100122212020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17295182211 (or 17295182209 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21100122212020 its reverse (2021222100112), we get a palindrome (23121344312132).

The spelling of 21100122212020 in words is "twenty-one trillion, one hundred billion, one hundred twenty-two million, two hundred twelve thousand, twenty".