121505131223 has 8 divisors (see below), whose sum is σ = 139192851360. Its totient is φ = 103899872160.

The previous prime is 121505131213. The next prime is 121505131247. The reversal of 121505131223 is 322131505121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121505131223 - 2⁶ = 121505131159 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121505131192 and 121505131201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121505131213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20612108 + ... + 20618001.

It is an arithmetic number, because the mean of its divisors is an integer number (17399106420).

Almost surely, 2^121505131223 is an apocalyptic number.

121505131223 is a deficient number, since it is larger than the sum of its proper divisors (17687720137).

121505131223 is an equidigital number, since it uses as much as digits as its factorization.

121505131223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41230537.

The product of its (nonzero) digits is 1800, while the sum is 26.

Adding to 121505131223 its reverse (322131505121), we get a palindrome (443636636344).

The spelling of 121505131223 in words is "one hundred twenty-one billion, five hundred five million, one hundred thirty-one thousand, two hundred twenty-three".