2101220000 has 120 divisors (see below), whose sum is σ = 5639844672. Its totient is φ = 764000000.

The previous prime is 2101219997. The next prime is 2101220003. The reversal of 2101220000 is 221012.

It is an interprime number because it is at equal distance from previous prime (2101219997) and next prime (2101220003).

It is a Harshad number since it is a multiple of its sum of digits (8).

It is a self number, because there is not a number n which added to its sum of digits gives 2101220000.

It is not an unprimeable number, because it can be changed into a prime (2101220003) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 215225 + ... + 224775.

Almost surely, 2^2101220000 is an apocalyptic number.

2101220000 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 2101220000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2819922336).

2101220000 is an abundant number, since it is smaller than the sum of its proper divisors (3538624672).

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

2101220000 is an equidigital number, since it uses as much as digits as its factorization.

2101220000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9592 (or 9569 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 2101220000 is about 45839.0663081176. The cubic root of 2101220000 is about 1280.8271021521.

Adding to 2101220000 its reverse (221012), we get a palindrome (2101441012).

The spelling of 2101220000 in words is "two billion, one hundred one million, two hundred twenty thousand".