121321554533 has 2 divisors, whose sum is σ = 121321554534. Its totient is φ = 121321554532.

The previous prime is 121321554517. The next prime is 121321554551. The reversal of 121321554533 is 335455123121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62541006724 + 58780547809 = 250082^2 + 242447^2 .

It is a cyclic number.

It is not a de Polignac number, because 121321554533 - 2⁴ = 121321554517 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121321554493 and 121321554502.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121321554503) 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, 60660777266 + 60660777267.

It is an arithmetic number, because the mean of its divisors is an integer number (60660777267).

Almost surely, 2^121321554533 is an apocalyptic number.

It is an amenable number.

121321554533 is a deficient number, since it is larger than the sum of its proper divisors (1).

121321554533 is an equidigital number, since it uses as much as digits as its factorization.

121321554533 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54000, while the sum is 35.

Adding to 121321554533 its reverse (335455123121), we get a palindrome (456776677654).

The spelling of 121321554533 in words is "one hundred twenty-one billion, three hundred twenty-one million, five hundred fifty-four thousand, five hundred thirty-three".