1212120110111 has 4 divisors (see below), whose sum is σ = 1275915905400. Its totient is φ = 1148324314824.

The previous prime is 1212120110101. The next prime is 1212120110137. The reversal of 1212120110111 is 1110110212121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1212120110111 is a prime.

It is a super-2 number, since 2×1212120110111² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212120110101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31897897616 + ... + 31897897653.

It is an arithmetic number, because the mean of its divisors is an integer number (318978976350).

Almost surely, 2^{1212120110111} is an apocalyptic number.

1212120110111 is a deficient number, since it is larger than the sum of its proper divisors (63795795289).

1212120110111 is an equidigital number, since it uses as much as digits as its factorization.

1212120110111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63795795288.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 1212120110111 its reverse (1110110212121), we get a palindrome (2322230322232).

It can be divided in two parts, 1212120 and 110111, that added together give a palindrome (1322231).

The spelling of 1212120110111 in words is "one trillion, two hundred twelve billion, one hundred twenty million, one hundred ten thousand, one hundred eleven".