111221011212 has 48 divisors (see below), whose sum is σ = 266855145312. Its totient is φ = 36027624960.

The previous prime is 111221011183. The next prime is 111221011241. The reversal of 111221011212 is 212110122111.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (111221011183) and next prime (111221011241).

It is a super-2 number, since 2×111221011212² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 111221011191 and 111221011200.

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 15 ways as a sum of consecutive naturals, for example, 211968 + ... + 517080.

It is an arithmetic number, because the mean of its divisors is an integer number (5559482194).

Almost surely, 2^111221011212 is an apocalyptic number.

111221011212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

111221011212 is an abundant number, since it is smaller than the sum of its proper divisors (155634134100).

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

111221011212 is a wasteful number, since it uses less digits than its factorization.

111221011212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305978 (or 305976 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 111221011212 its reverse (212110122111), we get a palindrome (323331133323).

The spelling of 111221011212 in words is "one hundred eleven billion, two hundred twenty-one million, eleven thousand, two hundred twelve".