311121011212111 has 4 divisors (see below), whose sum is σ = 313029729072472. Its totient is φ = 309212293351752.

The previous prime is 311121011212097. The next prime is 311121011212133. The reversal of 311121011212111 is 111212110121113.

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 311121011212111 - 2²¹ = 311121009114959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311121011210111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 954358929936 + ... + 954358930261.

It is an arithmetic number, because the mean of its divisors is an integer number (78257432268118).

Almost surely, 2^{311121011212111} is an apocalyptic number.

311121011212111 is a deficient number, since it is larger than the sum of its proper divisors (1908717860361).

311121011212111 is a wasteful number, since it uses less digits than its factorization.

311121011212111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1908717860360.

The product of its (nonzero) digits is 24, while the sum is 19.

Adding to 311121011212111 its reverse (111212110121113), we get a palindrome (422333121333224).

The spelling of 311121011212111 in words is "three hundred eleven trillion, one hundred twenty-one billion, eleven million, two hundred twelve thousand, one hundred eleven".