2120012100221 has 4 divisors (see below), whose sum is σ = 2134240369500. Its totient is φ = 2105783830944.

The previous prime is 2120012100191. The next prime is 2120012100223. The reversal of 2120012100221 is 1220012100212.

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 1211067235225 + 908944864996 = 1100485^2 + 953386^2 .

It is a cyclic number.

It is not a de Polignac number, because 2120012100221 - 2²⁶ = 2119944991357 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2120012100196 and 2120012100205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120012100223) 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, 7114134416 + ... + 7114134713.

It is an arithmetic number, because the mean of its divisors is an integer number (533560092375).

Almost surely, 2^{2120012100221} is an apocalyptic number.

It is an amenable number.

2120012100221 is a deficient number, since it is larger than the sum of its proper divisors (14228269279).

2120012100221 is a wasteful number, since it uses less digits than its factorization.

2120012100221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14228269278.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 2120012100221 its reverse (1220012100212), we get a palindrome (3340024200433).

Subtracting from 2120012100221 its reverse (1220012100212), we obtain a palindrome (900000000009).

The spelling of 2120012100221 in words is "two trillion, one hundred twenty billion, twelve million, one hundred thousand, two hundred twenty-one".