121321421369 has 2 divisors, whose sum is σ = 121321421370. Its totient is φ = 121321421368.

The previous prime is 121321421327. The next prime is 121321421371. The reversal of 121321421369 is 963124123121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 118225945600 + 3095475769 = 343840^2 + 55637^2 .

It is an emirp because it is prime and its reverse (963124123121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121321421369 is a prime.

It is a super-2 number, since 2×121321421369² (a number of 23 digits) contains 22 as substring.

Together with 121321421371, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121321420369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60660710684 + 60660710685.

It is an arithmetic number, because the mean of its divisors is an integer number (60660710685).

Almost surely, 2^121321421369 is an apocalyptic number.

It is an amenable number.

121321421369 is a deficient number, since it is larger than the sum of its proper divisors (1).

121321421369 is an equidigital number, since it uses as much as digits as its factorization.

121321421369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 35.

The spelling of 121321421369 in words is "one hundred twenty-one billion, three hundred twenty-one million, four hundred twenty-one thousand, three hundred sixty-nine".