2100221020 has 12 divisors (see below), whose sum is σ = 4410464184. Its totient is φ = 840088400.

The previous prime is 2100221017. The next prime is 2100221029. The reversal of 2100221020 is 201220012.

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 = 2100220988 and 2100221006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100221029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52505506 + ... + 52505545.

It is an arithmetic number, because the mean of its divisors is an integer number (367538682).

Almost surely, 2^2100221020 is an apocalyptic number.

2100221020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2100221020 is an abundant number, since it is smaller than the sum of its proper divisors (2310243164).

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

2100221020 is a wasteful number, since it uses less digits than its factorization.

2100221020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105011060 (or 105011058 counting only the distinct ones).

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

The square root of 2100221020 is about 45828.1684120149. The cubic root of 2100221020 is about 1280.6240893808.

Adding to 2100221020 its reverse (201220012), we get a palindrome (2301441032).

The spelling of 2100221020 in words is "two billion, one hundred million, two hundred twenty-one thousand, twenty".