12121012121111 has 8 divisors (see below), whose sum is σ = 12160708855680. Its totient is φ = 12081316780728.

The previous prime is 12121012121059. The next prime is 12121012121143. The reversal of 12121012121111 is 11112121012121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12121012121111 - 2²⁶ = 12120945012247 is a prime.

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 12121012121111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121012121311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18783950 + ... + 19418516.

It is an arithmetic number, because the mean of its divisors is an integer number (1520088606960).

Almost surely, 2^{12121012121111} is an apocalyptic number.

12121012121111 is a deficient number, since it is larger than the sum of its proper divisors (39696734569).

12121012121111 is an equidigital number, since it uses as much as digits as its factorization.

12121012121111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 697093.

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

Adding to 12121012121111 its reverse (11112121012121), we get a palindrome (23233133133232).

It can be divided in two parts, 12121012121 and 111, that multiplied together give a palindrome (1345432345431).

The spelling of 12121012121111 in words is "twelve trillion, one hundred twenty-one billion, twelve million, one hundred twenty-one thousand, one hundred eleven".