2121013220 has 12 divisors (see below), whose sum is σ = 4454127804. Its totient is φ = 848405280.

The previous prime is 2121013199. The next prime is 2121013253. The reversal of 2121013220 is 223101212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 446730496 + 1674282724 = 21136^2 + 40918^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2121013195 and 2121013204.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53025311 + ... + 53025350.

It is an arithmetic number, because the mean of its divisors is an integer number (371177317).

Almost surely, 2^2121013220 is an apocalyptic number.

2121013220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121013220 is an abundant number, since it is smaller than the sum of its proper divisors (2333114584).

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

2121013220 is a wasteful number, since it uses less digits than its factorization.

2121013220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106050670 (or 106050668 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 2121013220 is about 46054.4592846339. The cubic root of 2121013220 is about 1284.8362814831.

Adding to 2121013220 its reverse (223101212), we get a palindrome (2344114432).

The spelling of 2121013220 in words is "two billion, one hundred twenty-one million, thirteen thousand, two hundred twenty".