2120021121220 has 12 divisors (see below), whose sum is σ = 4452044354604. Its totient is φ = 848008448480.

The previous prime is 2120021121199. The next prime is 2120021121221. The reversal of 2120021121220 is 221211200212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 671180393536 + 1448840727684 = 819256^2 + 1203678^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2120021121194 and 2120021121203.

It is not an unprimeable number, because it can be changed into a prime (2120021121221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53000528011 + ... + 53000528050.

It is an arithmetic number, because the mean of its divisors is an integer number (371003696217).

Almost surely, 2^{2120021121220} is an apocalyptic number.

2120021121220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2120021121220 is an abundant number, since it is smaller than the sum of its proper divisors (2332023233384).

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

2120021121220 is a wasteful number, since it uses less digits than its factorization.

2120021121220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106001056070 (or 106001056068 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 2120021121220 its reverse (221211200212), we get a palindrome (2341232321432).

The spelling of 2120021121220 in words is "two trillion, one hundred twenty billion, twenty-one million, one hundred twenty-one thousand, two hundred twenty".