121222101111111 has 216 divisors, whose sum is σ = 247113432347184. Its totient is φ = 56557425899520.

The previous prime is 121222101111091. The next prime is 121222101111197. The reversal of 121222101111111 is 111111101222121.

121222101111111 is a `hidden beast` number, since 121 + 222 + 101 + 111 + 111 = 666.

It is not a de Polignac number, because 121222101111111 - 2⁶ = 121222101111047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121222100111111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 215 ways as a sum of consecutive naturals, for example, 28335135 + ... + 32331471.

It is an arithmetic number, because the mean of its divisors is an integer number (1144043668274).

Almost surely, 2^{121222101111111} is an apocalyptic number.

121222101111111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121222101111111 is an abundant number, since it is smaller than the sum of its proper divisors (125891331236073).

121222101111111 is a wasteful number, since it uses less digits than its factorization.

121222101111111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3996431 (or 3996408 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 18.

Adding to 121222101111111 its reverse (111111101222121), we get a palindrome (232333202333232).

The spelling of 121222101111111 in words is "one hundred twenty-one trillion, two hundred twenty-two billion, one hundred one million, one hundred eleven thousand, one hundred eleven".