23123213121 has 4 divisors (see below), whose sum is σ = 30830950832. Its totient is φ = 15415475412.

The previous prime is 23123213117. The next prime is 23123213143. The reversal of 23123213121 is 12131232132.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 23123213121 - 2² = 23123213117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23123213171) 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, 3853868851 + ... + 3853868856.

It is an arithmetic number, because the mean of its divisors is an integer number (7707737708).

Almost surely, 2^23123213121 is an apocalyptic number.

It is an amenable number.

23123213121 is a deficient number, since it is larger than the sum of its proper divisors (7707737711).

23123213121 is an equidigital number, since it uses as much as digits as its factorization.

23123213121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7707737710.

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

Adding to 23123213121 its reverse (12131232132), we get a palindrome (35254445253).

The spelling of 23123213121 in words is "twenty-three billion, one hundred twenty-three million, two hundred thirteen thousand, one hundred twenty-one".