12121010111 has 4 divisors (see below), whose sum is σ = 13852582992. Its totient is φ = 10389437232.

The previous prime is 12121010107. The next prime is 12121010117. The reversal of 12121010111 is 11101012121.

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 12121010111 - 2² = 12121010107 is a prime.

It is a super-2 number, since 2×12121010111² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12121010092 and 12121010101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121010117) 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, 865786430 + ... + 865786443.

It is an arithmetic number, because the mean of its divisors is an integer number (3463145748).

Almost surely, 2^12121010111 is an apocalyptic number.

12121010111 is a deficient number, since it is larger than the sum of its proper divisors (1731572881).

12121010111 is an equidigital number, since it uses as much as digits as its factorization.

12121010111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1731572880.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 12121010111 its reverse (11101012121), we get a palindrome (23222022232).

The spelling of 12121010111 in words is "twelve billion, one hundred twenty-one million, ten thousand, one hundred eleven".