12121101211111 has 16 divisors (see below), whose sum is σ = 12459598272000. Its totient is φ = 11785214907648.

The previous prime is 12121101211097. The next prime is 12121101211129. The reversal of 12121101211111 is 11111210112121.

It is a cyclic number.

It is not a de Polignac number, because 12121101211111 - 2⁷ = 12121101210983 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 (12121101211171) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27084040 + ... + 27527938.

It is an arithmetic number, because the mean of its divisors is an integer number (778724892000).

Almost surely, 2^{12121101211111} is an apocalyptic number.

12121101211111 is a deficient number, since it is larger than the sum of its proper divisors (338497060889).

12121101211111 is a wasteful number, since it uses less digits than its factorization.

12121101211111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 446838.

The product of its (nonzero) digits is 8, while the sum is 16.

Adding to 12121101211111 its reverse (11111210112121), we get a palindrome (23232311323232).

The spelling of 12121101211111 in words is "twelve trillion, one hundred twenty-one billion, one hundred one million, two hundred eleven thousand, one hundred eleven".