2121321347 has 2 divisors, whose sum is σ = 2121321348. Its totient is φ = 2121321346.

The previous prime is 2121321317. The next prime is 2121321361. The reversal of 2121321347 is 7431231212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2121321347 - 2⁸ = 2121321091 is a prime.

It is not a weakly prime, because it can be changed into another prime (2121321317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060660673 + 1060660674.

It is an arithmetic number, because the mean of its divisors is an integer number (1060660674).

Almost surely, 2^2121321347 is an apocalyptic number.

2121321347 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121321347 is an equidigital number, since it uses as much as digits as its factorization.

2121321347 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 26.

The square root of 2121321347 is about 46057.8044092421. The cubic root of 2121321347 is about 1284.8984960222.

Adding to 2121321347 its reverse (7431231212), we get a palindrome (9552552559).

The spelling of 2121321347 in words is "two billion, one hundred twenty-one million, three hundred twenty-one thousand, three hundred forty-seven".