121523503121 has 4 divisors (see below), whose sum is σ = 124487491044. Its totient is φ = 118559515200.

The previous prime is 121523503063. The next prime is 121523503147. The reversal of 121523503121 is 121305325121.

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 25850208400 + 95673294721 = 160780^2 + 309311^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121523503121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121523503021) 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, 1481993900 + ... + 1481993981.

It is an arithmetic number, because the mean of its divisors is an integer number (31121872761).

Almost surely, 2^121523503121 is an apocalyptic number.

It is an amenable number.

121523503121 is a deficient number, since it is larger than the sum of its proper divisors (2963987923).

121523503121 is an equidigital number, since it uses as much as digits as its factorization.

121523503121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2963987922.

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

Adding to 121523503121 its reverse (121305325121), we get a palindrome (242828828242).

The spelling of 121523503121 in words is "one hundred twenty-one billion, five hundred twenty-three million, five hundred three thousand, one hundred twenty-one".