23121212331 has 8 divisors (see below), whose sum is σ = 35232323584. Its totient is φ = 13212121320.

The previous prime is 23121212281. The next prime is 23121212333. The reversal of 23121212331 is 13321212132.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 23121212331 - 2¹⁰ = 23121211307 is a prime.

It is a super-2 number, since 2×23121212331² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 1101010111 = 23121212331 / (2 + 3 + 1 + 2 + 1 + 2 + 1 + 2 + 3 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23121212298 and 23121212307.

It is not an unprimeable number, because it can be changed into a prime (23121212333) 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 7 ways as a sum of consecutive naturals, for example, 550505035 + ... + 550505076.

It is an arithmetic number, because the mean of its divisors is an integer number (4404040448).

Almost surely, 2^23121212331 is an apocalyptic number.

23121212331 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

23121212331 is a deficient number, since it is larger than the sum of its proper divisors (12111111253).

23121212331 is a wasteful number, since it uses less digits than its factorization.

23121212331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1101010121.

The product of its digits is 432, while the sum is 21.

Adding to 23121212331 its reverse (13321212132), we get a palindrome (36442424463).

The spelling of 23121212331 in words is "twenty-three billion, one hundred twenty-one million, two hundred twelve thousand, three hundred thirty-one".