12212031078 has 96 divisors (see below), whose sum is σ = 29461828032. Its totient is φ = 3631392000.

The previous prime is 12212031077. The next prime is 12212031113. The reversal of 12212031078 is 87013021221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12212031077) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1302688 + ... + 1312028.

It is an arithmetic number, because the mean of its divisors is an integer number (306894042).

Almost surely, 2^12212031078 is an apocalyptic number.

12212031078 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12212031078, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14730914016).

12212031078 is an abundant number, since it is smaller than the sum of its proper divisors (17249796954).

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

12212031078 is a wasteful number, since it uses less digits than its factorization.

12212031078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9550 (or 9547 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

Adding to 12212031078 its reverse (87013021221), we get a palindrome (99225052299).

The spelling of 12212031078 in words is "twelve billion, two hundred twelve million, thirty-one thousand, seventy-eight".