12121022111 has 4 divisors (see below), whose sum is σ = 13222933224. Its totient is φ = 11019111000.

The previous prime is 12121022101. The next prime is 12121022119. The reversal of 12121022111 is 11122012121.

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 12121022111 - 2⁶ = 12121022047 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 (12121022119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 550955540 + ... + 550955561.

It is an arithmetic number, because the mean of its divisors is an integer number (3305733306).

Almost surely, 2^12121022111 is an apocalyptic number.

12121022111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12121022111 is a deficient number, since it is larger than the sum of its proper divisors (1101911113).

12121022111 is a wasteful number, since it uses less digits than its factorization.

12121022111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1101911112.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 12121022111 its reverse (11122012121), we get a palindrome (23243034232).

The spelling of 12121022111 in words is "twelve billion, one hundred twenty-one million, twenty-two thousand, one hundred eleven".