23011121111 has 4 divisors (see below), whose sum is σ = 25103041224. Its totient is φ = 20919201000.

The previous prime is 23011121053. The next prime is 23011121113. The reversal of 23011121111 is 11112111032.

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 23011121111 - 2¹⁰ = 23011120087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23011121113) 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, 1045960040 + ... + 1045960061.

It is an arithmetic number, because the mean of its divisors is an integer number (6275760306).

Almost surely, 2^23011121111 is an apocalyptic number.

23011121111 is a deficient number, since it is larger than the sum of its proper divisors (2091920113).

23011121111 is a wasteful number, since it uses less digits than its factorization.

23011121111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2091920112.

The product of its (nonzero) digits is 12, while the sum is 14.

Adding to 23011121111 its reverse (11112111032), we get a palindrome (34123232143).

The spelling of 23011121111 in words is "twenty-three billion, eleven million, one hundred twenty-one thousand, one hundred eleven".