12121120221111 has 48 divisors (see below), whose sum is σ = 19250308896000. Its totient is φ = 7288373157120.

The previous prime is 12121120221079. The next prime is 12121120221121. The reversal of 12121120221111 is 11112202112121.

It is a happy number.

12121120221111 is a `hidden beast` number, since 1 + 212 + 1 + 120 + 221 + 111 = 666.

It is not a de Polignac number, because 12121120221111 - 2⁵ = 12121120221079 is a prime.

It is a super-4 number, since 4×12121120221111⁴ (a number of 53 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121120221121) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 20194350 + ... + 20785908.

It is an arithmetic number, because the mean of its divisors is an integer number (401048102000).

Almost surely, 2^{12121120221111} is an apocalyptic number.

12121120221111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12121120221111 is a deficient number, since it is larger than the sum of its proper divisors (7129188674889).

12121120221111 is a wasteful number, since it uses less digits than its factorization.

12121120221111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 593204 (or 593201 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 12121120221111 its reverse (11112202112121), we get a palindrome (23233322333232).

The spelling of 12121120221111 in words is "twelve trillion, one hundred twenty-one billion, one hundred twenty million, two hundred twenty-one thousand, one hundred eleven".