2121102220 has 24 divisors (see below), whose sum is σ = 4488322608. Its totient is φ = 841963200.

The previous prime is 2121102197. The next prime is 2121102227. The reversal of 2121102220 is 222011212.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 2121102220.

It is not an unprimeable number, because it can be changed into a prime (2121102227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 402171 + ... + 407410.

It is an arithmetic number, because the mean of its divisors is an integer number (187013442).

Almost surely, 2^2121102220 is an apocalyptic number.

2121102220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121102220 is an abundant number, since it is smaller than the sum of its proper divisors (2367220388).

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

2121102220 is a wasteful number, since it uses less digits than its factorization.

2121102220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 809721 (or 809719 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 2121102220 is about 46055.4255218644. The cubic root of 2121102220 is about 1284.8542522700.

Adding to 2121102220 its reverse (222011212), we get a palindrome (2343113432).

The spelling of 2121102220 in words is "two billion, one hundred twenty-one million, one hundred two thousand, two hundred twenty".