1212120100111 has 4 divisors (see below), whose sum is σ = 1216836520992. Its totient is φ = 1207403679232.

The previous prime is 1212120100057. The next prime is 1212120100123. The reversal of 1212120100111 is 1110010212121.

It is a happy number.

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 1212120100111 - 2³⁹ = 662364286223 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1212120100091 and 1212120100100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212120100141) 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, 2358210055 + ... + 2358210568.

It is an arithmetic number, because the mean of its divisors is an integer number (304209130248).

Almost surely, 2^{1212120100111} is an apocalyptic number.

1212120100111 is a deficient number, since it is larger than the sum of its proper divisors (4716420881).

1212120100111 is an equidigital number, since it uses as much as digits as its factorization.

1212120100111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4716420880.

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

Adding to 1212120100111 its reverse (1110010212121), we get a palindrome (2322130312232).

The spelling of 1212120100111 in words is "one trillion, two hundred twelve billion, one hundred twenty million, one hundred thousand, one hundred eleven".