121220100111 has 48 divisors (see below), whose sum is σ = 187932901248. Its totient is φ = 68910264000.

The previous prime is 121220100109. The next prime is 121220100163. The reversal of 121220100111 is 111001022121.

It is not a de Polignac number, because 121220100111 - 2¹ = 121220100109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121220100181) 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 47 ways as a sum of consecutive naturals, for example, 1152840 + ... + 1253586.

It is an arithmetic number, because the mean of its divisors is an integer number (3915268776).

Almost surely, 2^121220100111 is an apocalyptic number.

121220100111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121220100111 is a deficient number, since it is larger than the sum of its proper divisors (66712801137).

121220100111 is a wasteful number, since it uses less digits than its factorization.

121220100111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100900 (or 100881 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 121220100111 its reverse (111001022121), we get a palindrome (232221122232).

The spelling of 121220100111 in words is "one hundred twenty-one billion, two hundred twenty million, one hundred thousand, one hundred eleven".