2121302111321 has 2 divisors, whose sum is σ = 2121302111322. Its totient is φ = 2121302111320.

The previous prime is 2121302111311. The next prime is 2121302111333. The reversal of 2121302111321 is 1231112031212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1145405095696 + 975897015625 = 1070236^2 + 987875^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121302111321 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2121302111293 and 2121302111302.

It is not a weakly prime, because it can be changed into another prime (2121302111311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060651055660 + 1060651055661.

It is an arithmetic number, because the mean of its divisors is an integer number (1060651055661).

Almost surely, 2^{2121302111321} is an apocalyptic number.

It is an amenable number.

2121302111321 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121302111321 is an equidigital number, since it uses as much as digits as its factorization.

2121302111321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 2121302111321 its reverse (1231112031212), we get a palindrome (3352414142533).

The spelling of 2121302111321 in words is "two trillion, one hundred twenty-one billion, three hundred two million, one hundred eleven thousand, three hundred twenty-one".