2121100002220 has 12 divisors (see below), whose sum is σ = 4454310004704. Its totient is φ = 848440000880.

The previous prime is 2121100002209. The next prime is 2121100002251. The reversal of 2121100002220 is 222000011212.

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 2121100002220.

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, 53027500036 + ... + 53027500075.

It is an arithmetic number, because the mean of its divisors is an integer number (371192500392).

Almost surely, 2^{2121100002220} is an apocalyptic number.

2121100002220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121100002220 is an abundant number, since it is smaller than the sum of its proper divisors (2333210002484).

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

2121100002220 is a wasteful number, since it uses less digits than its factorization.

2121100002220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106055000120 (or 106055000118 counting only the distinct ones).

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

Adding to 2121100002220 its reverse (222000011212), we get a palindrome (2343100013432).

The spelling of 2121100002220 in words is "two trillion, one hundred twenty-one billion, one hundred million, two thousand, two hundred twenty".