2120231001221 has 2 divisors, whose sum is σ = 2120231001222. Its totient is φ = 2120231001220.

The previous prime is 2120231001199. The next prime is 2120231001281. The reversal of 2120231001221 is 1221001320212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2109788205121 + 10442796100 = 1452511^2 + 102190^2 .

It is a cyclic number.

It is not a de Polignac number, because 2120231001221 - 2³⁰ = 2119157259397 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2120231001221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2120231001281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060115500610 + 1060115500611.

It is an arithmetic number, because the mean of its divisors is an integer number (1060115500611).

Almost surely, 2^{2120231001221} is an apocalyptic number.

It is an amenable number.

2120231001221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2120231001221 is an equidigital number, since it uses as much as digits as its factorization.

2120231001221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 2120231001221 its reverse (1221001320212), we get a palindrome (3341232321433).

The spelling of 2120231001221 in words is "two trillion, one hundred twenty billion, two hundred thirty-one million, one thousand, two hundred twenty-one".