121243554437 has 2 divisors, whose sum is σ = 121243554438. Its totient is φ = 121243554436.

The previous prime is 121243554427. The next prime is 121243554463. The reversal of 121243554437 is 734455342121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90385010881 + 30858543556 = 300641^2 + 175666^2 .

It is a cyclic number.

It is not a de Polignac number, because 121243554437 - 2⁶ = 121243554373 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121243554394 and 121243554403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121243554407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60621777218 + 60621777219.

It is an arithmetic number, because the mean of its divisors is an integer number (60621777219).

Almost surely, 2^121243554437 is an apocalyptic number.

It is an amenable number.

121243554437 is a deficient number, since it is larger than the sum of its proper divisors (1).

121243554437 is an equidigital number, since it uses as much as digits as its factorization.

121243554437 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 403200, while the sum is 41.

Adding to 121243554437 its reverse (734455342121), we get a palindrome (855698896558).

The spelling of 121243554437 in words is "one hundred twenty-one billion, two hundred forty-three million, five hundred fifty-four thousand, four hundred thirty-seven".