12121123111 has 8 divisors (see below), whose sum is σ = 12192265904. Its totient is φ = 12050026560.

The previous prime is 12121123081. The next prime is 12121123193. The reversal of 12121123111 is 11132112121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12121123111 - 2¹³ = 12121114919 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 (12121123711) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 611620 + ... + 631126.

It is an arithmetic number, because the mean of its divisors is an integer number (1524033238).

Almost surely, 2^12121123111 is an apocalyptic number.

12121123111 is a deficient number, since it is larger than the sum of its proper divisors (71142793).

12121123111 is a wasteful number, since it uses less digits than its factorization.

12121123111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23121.

The product of its digits is 24, while the sum is 16.

Adding to 12121123111 its reverse (11132112121), we get a palindrome (23253235232).

The spelling of 12121123111 in words is "twelve billion, one hundred twenty-one million, one hundred twenty-three thousand, one hundred eleven".