2100211220 has 48 divisors (see below), whose sum is σ = 4465193040. Its totient is φ = 829710336.

The previous prime is 2100211207. The next prime is 2100211249. The reversal of 2100211220 is 221120012.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 1674119056 + 426092164 = 40916^2 + 20642^2 .

It is a super-2 number, since 2×2100211220² = 8821774337227776800, which contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 705896 + ... + 708864.

It is an arithmetic number, because the mean of its divisors is an integer number (93024855).

Almost surely, 2^2100211220 is an apocalyptic number.

2100211220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2100211220 is an abundant number, since it is smaller than the sum of its proper divisors (2364981820).

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

2100211220 is a wasteful number, since it uses less digits than its factorization.

2100211220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3404 (or 3402 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 2100211220 is about 45828.0614907504. The cubic root of 2100211220 is about 1280.6220975055.

Adding to 2100211220 its reverse (221120012), we get a palindrome (2321331232).

The spelling of 2100211220 in words is "two billion, one hundred million, two hundred eleven thousand, two hundred twenty".