121321213291 has 2 divisors, whose sum is σ = 121321213292. Its totient is φ = 121321213290.

The previous prime is 121321213283. The next prime is 121321213313. The reversal of 121321213291 is 192312123121.

It is a weak prime.

It is an emirp because it is prime and its reverse (192312123121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121321213291 - 2³ = 121321213283 is a prime.

It is not a weakly prime, because it can be changed into another prime (121321213891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60660606645 + 60660606646.

It is an arithmetic number, because the mean of its divisors is an integer number (60660606646).

Almost surely, 2^121321213291 is an apocalyptic number.

121321213291 is a deficient number, since it is larger than the sum of its proper divisors (1).

121321213291 is an equidigital number, since it uses as much as digits as its factorization.

121321213291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 28.

The spelling of 121321213291 in words is "one hundred twenty-one billion, three hundred twenty-one million, two hundred thirteen thousand, two hundred ninety-one".