2220021000 has 128 divisors (see below), whose sum is σ = 7696166400. Its totient is φ = 591998400.

The previous prime is 2220020993. The next prime is 2220021029. The reversal of 2220021000 is 1200222.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14112 + ... + 68111.

It is an arithmetic number, because the mean of its divisors is an integer number (60126300).

Almost surely, 2^2220021000 is an apocalyptic number.

2220021000 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 2220021000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3848083200).

2220021000 is an abundant number, since it is smaller than the sum of its proper divisors (5476145400).

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

2220021000 is a wasteful number, since it uses less digits than its factorization.

2220021000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82253 (or 82233 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 2220021000 is about 47117.0988071210. The cubic root of 2220021000 is about 1304.5248633612.

Adding to 2220021000 its reverse (1200222), we get a palindrome (2221221222).

The spelling of 2220021000 in words is "two billion, two hundred twenty million, twenty-one thousand".