23121510011 has 4 divisors (see below), whose sum is σ = 23127018024. Its totient is φ = 23116002000.

The previous prime is 23121509977. The next prime is 23121510019. The reversal of 23121510011 is 11001512132.

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 23121510011 - 2¹⁰ = 23121508987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23121510019) 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, 2747705 + ... + 2756106.

It is an arithmetic number, because the mean of its divisors is an integer number (5781754506).

Almost surely, 2^23121510011 is an apocalyptic number.

23121510011 is a deficient number, since it is larger than the sum of its proper divisors (5508013).

23121510011 is an equidigital number, since it uses as much as digits as its factorization.

23121510011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5508012.

The product of its (nonzero) digits is 60, while the sum is 17.

The spelling of 23121510011 in words is "twenty-three billion, one hundred twenty-one million, five hundred ten thousand, eleven".