12123021111 has 16 divisors (see below), whose sum is σ = 16438302048. Its totient is φ = 7945027200.

The previous prime is 12123021109. The next prime is 12123021179. The reversal of 12123021111 is 11112032121.

It is not a de Polignac number, because 12123021111 - 2¹ = 12123021109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12123021511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 322765 + ... + 358361.

It is an arithmetic number, because the mean of its divisors is an integer number (1027393878).

Almost surely, 2^12123021111 is an apocalyptic number.

12123021111 is a deficient number, since it is larger than the sum of its proper divisors (4315280937).

12123021111 is a wasteful number, since it uses less digits than its factorization.

12123021111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37522.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 12123021111 its reverse (11112032121), we get a palindrome (23235053232).

The spelling of 12123021111 in words is "twelve billion, one hundred twenty-three million, twenty-one thousand, one hundred eleven".