2121002220 has 48 divisors (see below), whose sum is σ = 5943137760. Its totient is φ = 565188096.

The previous prime is 2121002207. The next prime is 2121002249. The reversal of 2121002220 is 222001212.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 2121002196 and 2121002205.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75016 + ... + 99344.

It is an arithmetic number, because the mean of its divisors is an integer number (123815370).

Almost surely, 2^2121002220 is an apocalyptic number.

2121002220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121002220 is an abundant number, since it is smaller than the sum of its proper divisors (3822135540).

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

2121002220 is a wasteful number, since it uses less digits than its factorization.

2121002220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25794 (or 25792 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 2121002220 is about 46054.3398606472. The cubic root of 2121002220 is about 1284.8340603397.

Adding to 2121002220 its reverse (222001212), we get a palindrome (2343003432).

The spelling of 2121002220 in words is "two billion, one hundred twenty-one million, two thousand, two hundred twenty".