23121243211 has 4 divisors (see below), whose sum is σ = 25223174424. Its totient is φ = 21019312000.

The previous prime is 23121243209. The next prime is 23121243217. The reversal of 23121243211 is 11234212132.

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 23121243211 - 2¹ = 23121243209 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23121243217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1050965590 + ... + 1050965611.

It is an arithmetic number, because the mean of its divisors is an integer number (6305793606).

Almost surely, 2^23121243211 is an apocalyptic number.

23121243211 is a deficient number, since it is larger than the sum of its proper divisors (2101931213).

23121243211 is a wasteful number, since it uses less digits than its factorization.

23121243211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2101931212.

The product of its digits is 576, while the sum is 22.

Adding to 23121243211 its reverse (11234212132), we get a palindrome (34355455343).

The spelling of 23121243211 in words is "twenty-three billion, one hundred twenty-one million, two hundred forty-three thousand, two hundred eleven".