1212111012011 has 4 divisors (see below), whose sum is σ = 1212209964024. Its totient is φ = 1212012060000.

The previous prime is 1212111012001. The next prime is 1212111012031. The reversal of 1212111012011 is 1102101112121.

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 1212111012011 - 2²² = 1212106817707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212111012001) 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 3 ways as a sum of consecutive naturals, for example, 49457630 + ... + 49482131.

It is an arithmetic number, because the mean of its divisors is an integer number (303052491006).

Almost surely, 2^{1212111012011} is an apocalyptic number.

1212111012011 is a deficient number, since it is larger than the sum of its proper divisors (98952013).

1212111012011 is an equidigital number, since it uses as much as digits as its factorization.

1212111012011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98952012.

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

Adding to 1212111012011 its reverse (1102101112121), we get a palindrome (2314212124132).

It can be divided in two parts, 12121110 and 12011, that added together give a palindrome (12133121).

The spelling of 1212111012011 in words is "one trillion, two hundred twelve billion, one hundred eleven million, twelve thousand, eleven".