21112221200020 has 12 divisors (see below), whose sum is σ = 44335664520084. Its totient is φ = 8444888480000.

The previous prime is 21112221199973. The next prime is 21112221200027. The reversal of 21112221200020 is 2000212221112.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 4182074080144 + 16930147119876 = 2045012^2 + 4114626^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21112221199967 and 21112221200003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112221200027) 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 3 ways as a sum of consecutive naturals, for example, 527805529981 + ... + 527805530020.

It is an arithmetic number, because the mean of its divisors is an integer number (3694638710007).

Almost surely, 2^{21112221200020} is an apocalyptic number.

21112221200020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21112221200020 is an abundant number, since it is smaller than the sum of its proper divisors (23223443320064).

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

21112221200020 is a wasteful number, since it uses less digits than its factorization.

21112221200020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1055611060010 (or 1055611060008 counting only the distinct ones).

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

Adding to 21112221200020 its reverse (2000212221112), we get a palindrome (23112433421132).

The spelling of 21112221200020 in words is "twenty-one trillion, one hundred twelve billion, two hundred twenty-one million, two hundred thousand, twenty".