111020121212 has 192 divisors, whose sum is σ = 268903219200. Its totient is φ = 38709861120.

The previous prime is 111020121167. The next prime is 111020121227. The reversal of 111020121212 is 212121020111.

It is a Harshad number since it is a multiple of its sum of digits (14).

111020121212 is a modest number, since divided by 121212 gives 111020 as remainder.

It is a congruent number.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 23929589 + ... + 23934227.

It is an arithmetic number, because the mean of its divisors is an integer number (1400537600).

Almost surely, 2^111020121212 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 111020121212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (134451609600).

111020121212 is an abundant number, since it is smaller than the sum of its proper divisors (157883097988).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

111020121212 is a wasteful number, since it uses less digits than its factorization.

111020121212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4856 (or 4854 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 111020121212 its reverse (212121020111), we get a palindrome (323141141323).

It can be divided in two parts, 111020 and 121212, that added together give a palindrome (232232).

The spelling of 111020121212 in words is "one hundred eleven billion, twenty million, one hundred twenty-one thousand, two hundred twelve".