2102321220 has 24 divisors (see below), whose sum is σ = 5886499584. Its totient is φ = 560618976.

The previous prime is 2102321191. The next prime is 2102321227. The reversal of 2102321220 is 221232012.

It is a happy number.

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 2102321220.

It is not an unprimeable number, because it can be changed into a prime (2102321227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17519284 + ... + 17519403.

It is an arithmetic number, because the mean of its divisors is an integer number (245270816).

Almost surely, 2^2102321220 is an apocalyptic number.

2102321220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2102321220 is an abundant number, since it is smaller than the sum of its proper divisors (3784178364).

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

2102321220 is a wasteful number, since it uses less digits than its factorization.

2102321220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35038699 (or 35038697 counting only the distinct ones).

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

The square root of 2102321220 is about 45851.0765413420. The cubic root of 2102321220 is about 1281.0508175952.

Adding to 2102321220 its reverse (221232012), we get a palindrome (2323553232).

The spelling of 2102321220 in words is "two billion, one hundred two million, three hundred twenty-one thousand, two hundred twenty".