21120020202020 has 24 divisors (see below), whose sum is σ = 44356563480768. Its totient is φ = 8447146927200.

The previous prime is 21120020202013. The next prime is 21120020202049. The reversal of 21120020202020 is 2020202002112.

It is a super-2 number, since 2×21120020202020² (a number of 27 digits) contains 22 as substring.

21120020202020 is a modest number, since divided by 20202020 gives 211200 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 21120020201986 and 21120020202004.

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 7 ways as a sum of consecutive naturals, for example, 53620976 + ... + 54013415.

It is an arithmetic number, because the mean of its divisors is an integer number (1848190145032).

Almost surely, 2^{21120020202020} is an apocalyptic number.

21120020202020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21120020202020 is an abundant number, since it is smaller than the sum of its proper divisors (23236543278748).

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

21120020202020 is a wasteful number, since it uses less digits than its factorization.

21120020202020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107644211 (or 107644209 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21120020202020 its reverse (2020202002112), we get a palindrome (23140222204132).

The spelling of 21120020202020 in words is "twenty-one trillion, one hundred twenty billion, twenty million, two hundred two thousand, twenty".