121212122012111 has 4 divisors (see below), whose sum is σ = 130536131397672. Its totient is φ = 111888112626552.

The previous prime is 121212122012101. The next prime is 121212122012117. The reversal of 121212122012111 is 111210221212121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121212122012111 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121212122012117) 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, 4662004692761 + ... + 4662004692786.

It is an arithmetic number, because the mean of its divisors is an integer number (32634032849418).

Almost surely, 2^{121212122012111} is an apocalyptic number.

121212122012111 is a deficient number, since it is larger than the sum of its proper divisors (9324009385561).

121212122012111 is an equidigital number, since it uses as much as digits as its factorization.

121212122012111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9324009385560.

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 121212122012111 its reverse (111210221212121), we get a palindrome (232422343224232).

The spelling of 121212122012111 in words is "one hundred twenty-one trillion, two hundred twelve billion, one hundred twenty-two million, twelve thousand, one hundred eleven".