1111231212 has 144 divisors (see below), whose sum is σ = 3336852960. Its totient is φ = 285078528.
The previous prime is 1111231201. The next prime is 1111231229. The reversal of 1111231212 is 2121321111.
It is a nude number because it is divisible by every one of its digits.
It is a junction number, because it is equal to n+sod(n) for n = 1111231191 and 1111231200.
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 280864 + ... + 284792.
It is an arithmetic number, because the mean of its divisors is an integer number (23172590).
Almost surely, 21111231212 is an apocalyptic number.
1111231212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 1111231212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1668426480).
1111231212 is an abundant number, since it is smaller than the sum of its proper divisors (2225621748).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1111231212 is a wasteful number, since it uses less digits than its factorization.
1111231212 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 4000 (or 3991 counting only the distinct ones).
The product of its digits is 24, while the sum is 15.
The square root of 1111231212 is about 33335.1347979875. The cubic root of 1111231212 is about 1035.7814854454.
Adding to 1111231212 its reverse (2121321111), we get a palindrome (3232552323).
It can be divided in two parts, 11112 and 31212, that added together give a palindrome (42324).
The spelling of 1111231212 in words is "one billion, one hundred eleven million, two hundred thirty-one thousand, two hundred twelve".
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