2120112021221 has 2 divisors, whose sum is σ = 2120112021222. Its totient is φ = 2120112021220.

The previous prime is 2120112021187. The next prime is 2120112021241. The reversal of 2120112021221 is 1221202110212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1277826768100 + 842285253121 = 1130410^2 + 917761^2 .

It is a cyclic number.

It is not a de Polignac number, because 2120112021221 - 2²² = 2120107826917 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2120112021221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2120112021241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060056010610 + 1060056010611.

It is an arithmetic number, because the mean of its divisors is an integer number (1060056010611).

Almost surely, 2^{2120112021221} is an apocalyptic number.

It is an amenable number.

2120112021221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2120112021221 is an equidigital number, since it uses as much as digits as its factorization.

2120112021221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 2120112021221 its reverse (1221202110212), we get a palindrome (3341314131433).

The spelling of 2120112021221 in words is "two trillion, one hundred twenty billion, one hundred twelve million, twenty-one thousand, two hundred twenty-one".