23121123111 has 32 divisors (see below), whose sum is σ = 35708682240. Its totient is φ = 14769108000.

The previous prime is 23121123097. The next prime is 23121123121. The reversal of 23121123111 is 11132112132.

It is not a de Polignac number, because 23121123111 - 2²⁹ = 22584252199 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23121123121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 52215 + ... + 221288.

It is an arithmetic number, because the mean of its divisors is an integer number (1115896320).

Almost surely, 2^23121123111 is an apocalyptic number.

23121123111 is a deficient number, since it is larger than the sum of its proper divisors (12587559129).

23121123111 is a wasteful number, since it uses less digits than its factorization.

23121123111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273644 (or 273638 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

Adding to 23121123111 its reverse (11132112132), we get a palindrome (34253235243).

The spelling of 23121123111 in words is "twenty-three billion, one hundred twenty-one million, one hundred twenty-three thousand, one hundred eleven".