23121211001 has 6 divisors (see below), whose sum is σ = 26896102650. Its totient is φ = 19818180816.

The previous prime is 23121210997. The next prime is 23121211007. The reversal of 23121211001 is 10011212132.

It can be written as a sum of positive squares in only one way, i.e., 14381765776 + 8739445225 = 119924^2 + 93485^2 .

It is not a de Polignac number, because 23121211001 - 2² = 23121210997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (23121211007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 235930676 + ... + 235930773.

It is an arithmetic number, because the mean of its divisors is an integer number (4482683775).

Almost surely, 2^23121211001 is an apocalyptic number.

It is an amenable number.

23121211001 is a deficient number, since it is larger than the sum of its proper divisors (3774891649).

23121211001 is an equidigital number, since it uses as much as digits as its factorization.

23121211001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 471861463 (or 471861456 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 23121211001 its reverse (10011212132), we get a palindrome (33132423133).

The spelling of 23121211001 in words is "twenty-three billion, one hundred twenty-one million, two hundred eleven thousand, one".