12021111112121 has 4 divisors (see below), whose sum is σ = 12021123432192. Its totient is φ = 12021098792052.

The previous prime is 12021111112093. The next prime is 12021111112163. The reversal of 12021111112121 is 12121111112021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12021111112121 - 2¹⁸ = 12021110849977 is a prime.

It is a super-2 number, since 2×12021111112121² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12021111112121.

It is not an unprimeable number, because it can be changed into a prime (12021111112421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4557461 + ... + 6694226.

It is an arithmetic number, because the mean of its divisors is an integer number (3005280858048).

Almost surely, 2^{12021111112121} is an apocalyptic number.

It is an amenable number.

12021111112121 is a deficient number, since it is larger than the sum of its proper divisors (12320071).

12021111112121 is a wasteful number, since it uses less digits than its factorization.

12021111112121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12320070.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 12021111112121 its reverse (12121111112021), we get a palindrome (24142222224142).

The spelling of 12021111112121 in words is "twelve trillion, twenty-one billion, one hundred eleven million, one hundred twelve thousand, one hundred twenty-one".