121503521054523 has 16 divisors (see below), whose sum is σ = 167591834853120. Its totient is φ = 78208803023904.

The previous prime is 121503521054483. The next prime is 121503521054527. The reversal of 121503521054523 is 325450125305121.

It is a de Polignac number, because none of the positive numbers 2^k-121503521054523 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121503521054527) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16487890 + ... + 22690472.

It is an arithmetic number, because the mean of its divisors is an integer number (10474489678320).

Almost surely, 2^{121503521054523} is an apocalyptic number.

121503521054523 is a deficient number, since it is larger than the sum of its proper divisors (46088313798597).

121503521054523 is a wasteful number, since it uses less digits than its factorization.

121503521054523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6427778.

The product of its (nonzero) digits is 180000, while the sum is 39.

Adding to 121503521054523 its reverse (325450125305121), we get a palindrome (446953646359644).

The spelling of 121503521054523 in words is "one hundred twenty-one trillion, five hundred three billion, five hundred twenty-one million, fifty-four thousand, five hundred twenty-three".