121210012112111 has 4 divisors (see below), whose sum is σ = 130533859197672. Its totient is φ = 111886165026552.

The previous prime is 121210012112051. The next prime is 121210012112131. The reversal of 121210012112111 is 111211210012121.

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 121210012112111 - 2⁶ = 121210012112047 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 121210012112111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121210012112131) 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, 4661923542761 + ... + 4661923542786.

It is an arithmetic number, because the mean of its divisors is an integer number (32633464799418).

Almost surely, 2^{121210012112111} is an apocalyptic number.

121210012112111 is a deficient number, since it is larger than the sum of its proper divisors (9323847085561).

121210012112111 is an equidigital number, since it uses as much as digits as its factorization.

121210012112111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9323847085560.

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

Adding to 121210012112111 its reverse (111211210012121), we get a palindrome (232421222124232).

The spelling of 121210012112111 in words is "one hundred twenty-one trillion, two hundred ten billion, twelve million, one hundred twelve thousand, one hundred eleven".