121505434553 has 2 divisors, whose sum is σ = 121505434554. Its totient is φ = 121505434552.

The previous prime is 121505434543. The next prime is 121505434577. The reversal of 121505434553 is 355434505121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70430790544 + 51074644009 = 265388^2 + 225997^2 .

It is an emirp because it is prime and its reverse (355434505121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121505434553 - 2⁴ = 121505434537 is a prime.

It is not a weakly prime, because it can be changed into another prime (121505434543) 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, 60752717276 + 60752717277.

It is an arithmetic number, because the mean of its divisors is an integer number (60752717277).

Almost surely, 2^121505434553 is an apocalyptic number.

It is an amenable number.

121505434553 is a deficient number, since it is larger than the sum of its proper divisors (1).

121505434553 is an equidigital number, since it uses as much as digits as its factorization.

121505434553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180000, while the sum is 38.

Adding to 121505434553 its reverse (355434505121), we get a palindrome (476939939674).

The spelling of 121505434553 in words is "one hundred twenty-one billion, five hundred five million, four hundred thirty-four thousand, five hundred fifty-three".