23121101231 has 4 divisors (see below), whose sum is σ = 23124422112. Its totient is φ = 23117780352.

The previous prime is 23121101203. The next prime is 23121101239. The reversal of 23121101231 is 13210112132.

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 23121101231 - 2²² = 23116906927 is a prime.

It is a super-2 number, since 2×23121101231² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23121101239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1649975 + ... + 1663928.

It is an arithmetic number, because the mean of its divisors is an integer number (5781105528).

Almost surely, 2^23121101231 is an apocalyptic number.

23121101231 is a deficient number, since it is larger than the sum of its proper divisors (3320881).

23121101231 is an equidigital number, since it uses as much as digits as its factorization.

23121101231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3320880.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 23121101231 its reverse (13210112132), we get a palindrome (36331213363).

The spelling of 23121101231 in words is "twenty-three billion, one hundred twenty-one million, one hundred one thousand, two hundred thirty-one".