2120021020221 has 16 divisors (see below), whose sum is σ = 3044418990144. Its totient is φ = 1304505644544.

The previous prime is 2120021020217. The next prime is 2120021020223. The reversal of 2120021020221 is 1220201200212.

It is not a de Polignac number, because 2120021020221 - 2² = 2120021020217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2120021020221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120021020223) 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, 2134791 + ... + 2966036.

It is an arithmetic number, because the mean of its divisors is an integer number (190276186884).

Almost surely, 2^{2120021020221} is an apocalyptic number.

It is an amenable number.

2120021020221 is a deficient number, since it is larger than the sum of its proper divisors (924397969923).

2120021020221 is a wasteful number, since it uses less digits than its factorization.

2120021020221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5111500.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 2120021020221 its reverse (1220201200212), we get a palindrome (3340222220433).

The spelling of 2120021020221 in words is "two trillion, one hundred twenty billion, twenty-one million, twenty thousand, two hundred twenty-one".