23121243212 has 12 divisors (see below), whose sum is σ = 42221400816. Its totient is φ = 11057985840.

The previous prime is 23121243209. The next prime is 23121243217. The reversal of 23121243212 is 21234212132.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is not an unprimeable number, because it can be changed into a prime (23121243217) 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, 125658839 + ... + 125659022.

It is an arithmetic number, because the mean of its divisors is an integer number (3518450068).

Almost surely, 2^23121243212 is an apocalyptic number.

It is an amenable number.

23121243212 is a deficient number, since it is larger than the sum of its proper divisors (19100157604).

23121243212 is a wasteful number, since it uses less digits than its factorization.

23121243212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251317888 (or 251317886 counting only the distinct ones).

The product of its digits is 1152, while the sum is 23.

Adding to 23121243212 its reverse (21234212132), we get a palindrome (44355455344).

The spelling of 23121243212 in words is "twenty-three billion, one hundred twenty-one million, two hundred forty-three thousand, two hundred twelve".