121321421327 has 2 divisors, whose sum is σ = 121321421328. Its totient is φ = 121321421326.

The previous prime is 121321421311. The next prime is 121321421369. The reversal of 121321421327 is 723124123121.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (723124123121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121321421327 - 2⁴ = 121321421311 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121321421327.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121321424327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60660710663 + 60660710664.

It is an arithmetic number, because the mean of its divisors is an integer number (60660710664).

Almost surely, 2^121321421327 is an apocalyptic number.

121321421327 is a deficient number, since it is larger than the sum of its proper divisors (1).

121321421327 is an equidigital number, since it uses as much as digits as its factorization.

121321421327 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4032, while the sum is 29.

Adding to 121321421327 its reverse (723124123121), we get a palindrome (844445544448).

The spelling of 121321421327 in words is "one hundred twenty-one billion, three hundred twenty-one million, four hundred twenty-one thousand, three hundred twenty-seven".