2101232220 has 96 divisors (see below), whose sum is σ = 6128027136. Its totient is φ = 537465600.

The previous prime is 2101232197. The next prime is 2101232251. The reversal of 2101232220 is 222321012.

It is a happy number.

It is a super-2 number, since 2×2101232220² = 8830353684732256800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 2101232220.

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 31 ways as a sum of consecutive naturals, for example, 150955 + ... + 164285.

It is an arithmetic number, because the mean of its divisors is an integer number (63833616).

Almost surely, 2^2101232220 is an apocalyptic number.

2101232220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2101232220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3064013568).

2101232220 is an abundant number, since it is smaller than the sum of its proper divisors (4026794916).

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

2101232220 is a wasteful number, since it uses less digits than its factorization.

2101232220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13451 (or 13449 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 2101232220 is about 45839.1996003421. The cubic root of 2101232220 is about 1280.8295851028.

Adding to 2101232220 its reverse (222321012), we get a palindrome (2323553232).

The spelling of 2101232220 in words is "two billion, one hundred one million, two hundred thirty-two thousand, two hundred twenty".