121253036526605 has 4 divisors (see below), whose sum is σ = 145503643831932. Its totient is φ = 97002429221280.

The previous prime is 121253036526539. The next prime is 121253036526653. The reversal of 121253036526605 is 506625630352121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14285875071556 + 106967161455049 = 3779666^2 + 10342493^2 .

It is not a de Polignac number, because 121253036526605 - 2²² = 121253032332301 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121253036526605.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12125303652656 + ... + 12125303652665.

It is an arithmetic number, because the mean of its divisors is an integer number (36375910957983).

Almost surely, 2^{121253036526605} is an apocalyptic number.

It is an amenable number.

121253036526605 is a deficient number, since it is larger than the sum of its proper divisors (24250607305327).

121253036526605 is an equidigital number, since it uses as much as digits as its factorization.

121253036526605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24250607305326.

The product of its (nonzero) digits is 1944000, while the sum is 47.

Adding to 121253036526605 its reverse (506625630352121), we get a palindrome (627878666878726).

The spelling of 121253036526605 in words is "one hundred twenty-one trillion, two hundred fifty-three billion, thirty-six million, five hundred twenty-six thousand, six hundred five".