121221112112111 has 16 divisors (see below), whose sum is σ = 132617347517088. Its totient is φ = 109887572889600.

The previous prime is 121221112112081. The next prime is 121221112112159. The reversal of 121221112112111 is 111211211122121.

It is a de Polignac number, because none of the positive numbers 2^k-121221112112111 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 (121221112112011) 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, 604020695 + ... + 604221351.

It is an arithmetic number, because the mean of its divisors is an integer number (8288584219818).

Almost surely, 2^{121221112112111} is an apocalyptic number.

121221112112111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121221112112111 is a deficient number, since it is larger than the sum of its proper divisors (11396235404977).

121221112112111 is a wasteful number, since it uses less digits than its factorization.

121221112112111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356602.

The product of its digits is 32, while the sum is 20.

Adding to 121221112112111 its reverse (111211211122121), we get a palindrome (232432323234232).

The spelling of 121221112112111 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, one hundred twelve million, one hundred twelve thousand, one hundred eleven".