2120111321 has 2 divisors, whose sum is σ = 2120111322. Its totient is φ = 2120111320.

The previous prime is 2120111309. The next prime is 2120111347. The reversal of 2120111321 is 1231110212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1952667721 + 167443600 = 44189^2 + 12940^2 .

It is a cyclic number.

It is not a de Polignac number, because 2120111321 - 2¹⁴ = 2120094937 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2120111296 and 2120111305.

It is not a weakly prime, because it can be changed into another prime (2120111221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060055660 + 1060055661.

It is an arithmetic number, because the mean of its divisors is an integer number (1060055661).

Almost surely, 2^2120111321 is an apocalyptic number.

It is an amenable number.

2120111321 is a deficient number, since it is larger than the sum of its proper divisors (1).

2120111321 is an equidigital number, since it uses as much as digits as its factorization.

2120111321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 2120111321 is about 46044.6665858273. Note that the first 3 decimals coincide. The cubic root of 2120111321 is about 1284.6541426146.

Adding to 2120111321 its reverse (1231110212), we get a palindrome (3351221533).

The spelling of 2120111321 in words is "two billion, one hundred twenty million, one hundred eleven thousand, three hundred twenty-one".