121212100111 has 8 divisors (see below), whose sum is σ = 121479003648. Its totient is φ = 120945279000.

The previous prime is 121212100049. The next prime is 121212100171. The reversal of 121212100111 is 111001212121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121212100111 - 2²¹ = 121210002959 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121212100091 and 121212100100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121212100171) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3622146 + ... + 3655456.

It is an arithmetic number, because the mean of its divisors is an integer number (15184875456).

Almost surely, 2^121212100111 is an apocalyptic number.

121212100111 is a deficient number, since it is larger than the sum of its proper divisors (266903537).

121212100111 is an equidigital number, since it uses as much as digits as its factorization.

121212100111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41213.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 121212100111 its reverse (111001212121), we get a palindrome (232213312232).

The spelling of 121212100111 in words is "one hundred twenty-one billion, two hundred twelve million, one hundred thousand, one hundred eleven".