12121201001111 has 4 divisors (see below), whose sum is σ = 12246161836272. Its totient is φ = 11996240165952.

The previous prime is 12121201001101. The next prime is 12121201001123. The reversal of 12121201001111 is 11110010212121.

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 12121201001111 - 2²⁶ = 12121133892247 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 (12121201001101) 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, 62480417435 + ... + 62480417628.

It is an arithmetic number, because the mean of its divisors is an integer number (3061540459068).

Almost surely, 2^{12121201001111} is an apocalyptic number.

12121201001111 is a deficient number, since it is larger than the sum of its proper divisors (124960835161).

12121201001111 is an equidigital number, since it uses as much as digits as its factorization.

12121201001111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124960835160.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 12121201001111 its reverse (11110010212121), we get a palindrome (23231211213232).

The spelling of 12121201001111 in words is "twelve trillion, one hundred twenty-one billion, two hundred one million, one thousand, one hundred eleven".