121240261523 has 4 divisors (see below), whose sum is σ = 121279136160. Its totient is φ = 121201386888.

The previous prime is 121240261511. The next prime is 121240261567. The reversal of 121240261523 is 325162042121.

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

It is a cyclic number.

It is not a de Polignac number, because 121240261523 - 2¹⁰ = 121240260499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121240281523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19432640 + ... + 19438877.

It is an arithmetic number, because the mean of its divisors is an integer number (30319784040).

Almost surely, 2^121240261523 is an apocalyptic number.

121240261523 is a deficient number, since it is larger than the sum of its proper divisors (38874637).

121240261523 is an equidigital number, since it uses as much as digits as its factorization.

121240261523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38874636.

The product of its (nonzero) digits is 5760, while the sum is 29.

The spelling of 121240261523 in words is "one hundred twenty-one billion, two hundred forty million, two hundred sixty-one thousand, five hundred twenty-three".