21210112202020 has 96 divisors (see below), whose sum is σ = 52845668064000. Its totient is φ = 6996467971584.

The previous prime is 21210112202009. The next prime is 21210112202189. The reversal of 21210112202020 is 2020221101212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21210112201985 and 21210112202003.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 8080995 + ... + 10378954.

It is an arithmetic number, because the mean of its divisors is an integer number (550475709000).

Almost surely, 2^{21210112202020} is an apocalyptic number.

21210112202020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21210112202020 is an abundant number, since it is smaller than the sum of its proper divisors (31635555861980).

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

21210112202020 is a wasteful number, since it uses less digits than its factorization.

21210112202020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18460277 (or 18460275 counting only the distinct ones).

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

Adding to 21210112202020 its reverse (2020221101212), we get a palindrome (23230333303232).

The spelling of 21210112202020 in words is "twenty-one trillion, two hundred ten billion, one hundred twelve million, two hundred two thousand, twenty".