2101222220 has 12 divisors (see below), whose sum is σ = 4412566704. Its totient is φ = 840488880.

The previous prime is 2101222199. The next prime is 2101222261. The reversal of 2101222220 is 222221012.

It is a junction number, because it is equal to n+sod(n) for n = 2101222195 and 2101222204.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52530536 + ... + 52530575.

It is an arithmetic number, because the mean of its divisors is an integer number (367713892).

Almost surely, 2^2101222220 is an apocalyptic number.

2101222220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2101222220 is an abundant number, since it is smaller than the sum of its proper divisors (2311344484).

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

2101222220 is a wasteful number, since it uses less digits than its factorization.

2101222220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105061120 (or 105061118 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 2101222220 is about 45839.0905232641. The cubic root of 2101222220 is about 1280.8275532290.

Adding to 2101222220 its reverse (222221012), we get a palindrome (2323443232).

The spelling of 2101222220 in words is "two billion, one hundred one million, two hundred twenty-two thousand, two hundred twenty".