2101220000020 has 24 divisors (see below), whose sum is σ = 4419690559200. Its totient is φ = 839130179232.

The previous prime is 2101219999993. The next prime is 2101220000021. The reversal of 2101220000020 is 200000221012.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 2101219999961 and 2101220000006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101220000021) 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, 84851110 + ... + 84875869.

It is an arithmetic number, because the mean of its divisors is an integer number (184153773300).

Almost surely, 2^{2101220000020} is an apocalyptic number.

2101220000020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2101220000020 is an abundant number, since it is smaller than the sum of its proper divisors (2318470559180).

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

2101220000020 is a wasteful number, since it uses less digits than its factorization.

2101220000020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169727607 (or 169727605 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 2101220000020 its reverse (200000221012), we get a palindrome (2301220221032).

The spelling of 2101220000020 in words is "two trillion, one hundred one billion, two hundred twenty million, twenty", and thus it is an aban number.