2100000220020 has 72 divisors (see below), whose sum is σ = 6370677855360. Its totient is φ = 559940525760.

The previous prime is 2100000220007. The next prime is 2100000220063. The reversal of 2100000220020 is 200220000012.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 2100000219984 and 2100000220011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1090825 + ... + 2321615.

It is an arithmetic number, because the mean of its divisors is an integer number (88481636880).

Almost surely, 2^{2100000220020} is an apocalyptic number.

2100000220020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2100000220020 is an abundant number, since it is smaller than the sum of its proper divisors (4270677635340).

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

2100000220020 is a wasteful number, since it uses less digits than its factorization.

2100000220020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1240285 (or 1240280 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

Adding to 2100000220020 its reverse (200220000012), we get a palindrome (2300220220032).

The spelling of 2100000220020 in words is "two trillion, one hundred billion, two hundred twenty thousand, twenty".