2121311393 has 2 divisors, whose sum is σ = 2121311394. Its totient is φ = 2121311392.

The previous prime is 2121311359. The next prime is 2121311441. The reversal of 2121311393 is 3931131212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1858644544 + 262666849 = 43112^2 + 16207^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121311393 - 2⁶ = 2121311329 is a prime.

It is not a weakly prime, because it can be changed into another prime (2121310393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060655696 + 1060655697.

It is an arithmetic number, because the mean of its divisors is an integer number (1060655697).

Almost surely, 2^2121311393 is an apocalyptic number.

It is an amenable number.

2121311393 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121311393 is an equidigital number, since it uses as much as digits as its factorization.

2121311393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 972, while the sum is 26.

The square root of 2121311393 is about 46057.6963492531. The cubic root of 2121311393 is about 1284.8964862843.

The spelling of 2121311393 in words is "two billion, one hundred twenty-one million, three hundred eleven thousand, three hundred ninety-three".