2101220020 has 12 divisors (see below), whose sum is σ = 4412562084. Its totient is φ = 840488000.

The previous prime is 2101220003. The next prime is 2101220057. The reversal of 2101220020 is 200221012.

It can be written as a sum of positive squares in 2 ways, for example, as 1604643364 + 496576656 = 40058^2 + 22284^2 .

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 = 2101219979 and 2101220006.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52530481 + ... + 52530520.

It is an arithmetic number, because the mean of its divisors is an integer number (367713507).

Almost surely, 2^2101220020 is an apocalyptic number.

2101220020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2101220020 is an abundant number, since it is smaller than the sum of its proper divisors (2311342064).

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

2101220020 is a wasteful number, since it uses less digits than its factorization.

2101220020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105061010 (or 105061008 counting only the distinct ones).

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

The square root of 2101220020 is about 45839.0665262721. The cubic root of 2101220020 is about 1280.8271062159.

Adding to 2101220020 its reverse (200221012), we get a palindrome (2301441032).

The spelling of 2101220020 in words is "two billion, one hundred one million, two hundred twenty thousand, twenty".