121210100111 has 4 divisors (see below), whose sum is σ = 121604921592. Its totient is φ = 120815278632.

The previous prime is 121210100083. The next prime is 121210100159. The reversal of 121210100111 is 111001012121.

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 121210100111 - 2¹⁴ = 121210083727 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121210100092 and 121210100101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121210100911) 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, 197410280 + ... + 197410893.

It is an arithmetic number, because the mean of its divisors is an integer number (30401230398).

Almost surely, 2^121210100111 is an apocalyptic number.

121210100111 is a deficient number, since it is larger than the sum of its proper divisors (394821481).

121210100111 is an equidigital number, since it uses as much as digits as its factorization.

121210100111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394821480.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 121210100111 its reverse (111001012121), we get a palindrome (232211112232).

The spelling of 121210100111 in words is "one hundred twenty-one billion, two hundred ten million, one hundred thousand, one hundred eleven".