23121220231 has 2 divisors, whose sum is σ = 23121220232. Its totient is φ = 23121220230.

The previous prime is 23121220229. The next prime is 23121220249. The reversal of 23121220231 is 13202212132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 23121220231 - 2¹ = 23121220229 is a prime.

It is a super-2 number, since 2×23121220231² (a number of 22 digits) contains 22 as substring.

Together with 23121220229, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 23121220199 and 23121220208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23121220201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11560610115 + 11560610116.

It is an arithmetic number, because the mean of its divisors is an integer number (11560610116).

Almost surely, 2^23121220231 is an apocalyptic number.

23121220231 is a deficient number, since it is larger than the sum of its proper divisors (1).

23121220231 is an equidigital number, since it uses as much as digits as its factorization.

23121220231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 23121220231 its reverse (13202212132), we get a palindrome (36323432363).

The spelling of 23121220231 in words is "twenty-three billion, one hundred twenty-one million, two hundred twenty thousand, two hundred thirty-one".