111212121303 has 12 divisors (see below), whose sum is σ = 160913400648. Its totient is φ = 74015105040.

The previous prime is 111212121301. The next prime is 111212121311. The reversal of 111212121303 is 303121212111.

It is not a de Polignac number, because 111212121303 - 2¹ = 111212121301 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111212121301) 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 11 ways as a sum of consecutive naturals, for example, 10520188 + ... + 10530753.

It is an arithmetic number, because the mean of its divisors is an integer number (13409450054).

Almost surely, 2^111212121303 is an apocalyptic number.

111212121303 is a deficient number, since it is larger than the sum of its proper divisors (49701279345).

111212121303 is a wasteful number, since it uses less digits than its factorization.

111212121303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21051534 (or 21051531 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 111212121303 its reverse (303121212111), we get a palindrome (414333333414).

The spelling of 111212121303 in words is "one hundred eleven billion, two hundred twelve million, one hundred twenty-one thousand, three hundred three".