2100212220 has 48 divisors (see below), whose sum is σ = 5882597280. Its totient is φ = 559865856.

The previous prime is 2100212209. The next prime is 2100212227. The reversal of 2100212220 is 222120012.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 2100212196 and 2100212205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100212227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 310636 + ... + 317324.

It is an arithmetic number, because the mean of its divisors is an integer number (122554110).

Almost surely, 2^2100212220 is an apocalyptic number.

2100212220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2100212220 is an abundant number, since it is smaller than the sum of its proper divisors (3782385060).

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

2100212220 is a wasteful number, since it uses less digits than its factorization.

2100212220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11934 (or 11932 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 2100212220 is about 45828.0724010949. The cubic root of 2100212220 is about 1280.6223007583.

Adding to 2100212220 its reverse (222120012), we get a palindrome (2322332232).

The spelling of 2100212220 in words is "two billion, one hundred million, two hundred twelve thousand, two hundred twenty".