2121001101220 has 48 divisors (see below), whose sum is σ = 4716282276720. Its totient is φ = 798465081344.

The previous prime is 2121001101217. The next prime is 2121001101227. The reversal of 2121001101220 is 221011001212.

It can be written as a sum of positive squares in 8 ways, for example, as 29743831296 + 2091257269924 = 172464^2 + 1446118^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2121001101220.

It is not an unprimeable number, because it can be changed into a prime (2121001101227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10575636 + ... + 10774324.

It is an arithmetic number, because the mean of its divisors is an integer number (98255880765).

Almost surely, 2^{2121001101220} is an apocalyptic number.

2121001101220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121001101220 is an abundant number, since it is smaller than the sum of its proper divisors (2595281175500).

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

2121001101220 is a wasteful number, since it uses less digits than its factorization.

2121001101220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230112 (or 230110 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 2121001101220 its reverse (221011001212), we get a palindrome (2342012102432).

The spelling of 2121001101220 in words is "two trillion, one hundred twenty-one billion, one million, one hundred one thousand, two hundred twenty".