2120010111221 has 4 divisors (see below), whose sum is σ = 2141000310444. Its totient is φ = 2099019912000.

The previous prime is 2120010111199. The next prime is 2120010111223. The reversal of 2120010111221 is 1221110100212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1919995438321 + 200014672900 = 1385639^2 + 447230^2 .

It is a cyclic number.

It is not a de Polignac number, because 2120010111221 - 2²⁶ = 2119943002357 is a prime.

It is a super-2 number, since 2×2120010111221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2120010111196 and 2120010111205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120010111223) 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, 10495099460 + ... + 10495099661.

It is an arithmetic number, because the mean of its divisors is an integer number (535250077611).

Almost surely, 2^{2120010111221} is an apocalyptic number.

It is an amenable number.

2120010111221 is a deficient number, since it is larger than the sum of its proper divisors (20990199223).

2120010111221 is a wasteful number, since it uses less digits than its factorization.

2120010111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20990199222.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 2120010111221 its reverse (1221110100212), we get a palindrome (3341120211433).

The spelling of 2120010111221 in words is "two trillion, one hundred twenty billion, ten million, one hundred eleven thousand, two hundred twenty-one".