23121320010515 has 4 divisors (see below), whose sum is σ = 27745584012624. Its totient is φ = 18497056008408.

The previous prime is 23121320010511. The next prime is 23121320010539. The reversal of 23121320010515 is 51501002312132.

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 23121320010515 - 2² = 23121320010511 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23121320010511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2312132001047 + ... + 2312132001056.

It is an arithmetic number, because the mean of its divisors is an integer number (6936396003156).

Almost surely, 2^{23121320010515} is an apocalyptic number.

23121320010515 is a deficient number, since it is larger than the sum of its proper divisors (4624264002109).

23121320010515 is an equidigital number, since it uses as much as digits as its factorization.

23121320010515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4624264002108.

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

Adding to 23121320010515 its reverse (51501002312132), we get a palindrome (74622322322647).

The spelling of 23121320010515 in words is "twenty-three trillion, one hundred twenty-one billion, three hundred twenty million, ten thousand, five hundred fifteen".