121756612131423 has 24 divisors (see below), whose sum is σ = 176933606417568. Its totient is φ = 80680539003072.

The previous prime is 121756612131373. The next prime is 121756612131439. The reversal of 121756612131423 is 324131216657121.

121756612131423 is a `hidden beast` number, since 1 + 2 + 1 + 7 + 5 + 6 + 6 + 1 + 213 + 1 + 423 = 666.

It is not a de Polignac number, because 121756612131423 - 2¹² = 121756612127327 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121756612131223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24929065 + ... + 29410397.

It is an arithmetic number, because the mean of its divisors is an integer number (7372233600732).

Almost surely, 2^{121756612131423} is an apocalyptic number.

121756612131423 is a deficient number, since it is larger than the sum of its proper divisors (55176994286145).

121756612131423 is a wasteful number, since it uses less digits than its factorization.

121756612131423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4499583 (or 4499580 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

Adding to 121756612131423 its reverse (324131216657121), we get a palindrome (445887828788544).

The spelling of 121756612131423 in words is "one hundred twenty-one trillion, seven hundred fifty-six billion, six hundred twelve million, one hundred thirty-one thousand, four hundred twenty-three".