2220021100 has 72 divisors (see below), whose sum is σ = 5283130608. Its totient is φ = 803020800.

The previous prime is 2220021061. The next prime is 2220021101. The reversal of 2220021100 is 11200222.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (2220021101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 207072 + ... + 217528.

It is an arithmetic number, because the mean of its divisors is an integer number (73376814).

Almost surely, 2^2220021100 is an apocalyptic number.

2220021100 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 2220021100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2641565304).

2220021100 is an abundant number, since it is smaller than the sum of its proper divisors (3063109508).

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

2220021100 is a wasteful number, since it uses less digits than its factorization.

2220021100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10675 (or 10668 counting only the distinct ones).

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

The square root of 2220021100 is about 47117.0998683068. The cubic root of 2220021100 is about 1304.5248829485.

Adding to 2220021100 its reverse (11200222), we get a palindrome (2231221322).

The spelling of 2220021100 in words is "two billion, two hundred twenty million, twenty-one thousand, one hundred".