12121223012 has 6 divisors (see below), whose sum is σ = 21212140278. Its totient is φ = 6060611504.

The previous prime is 12121223011. The next prime is 12121223017. The reversal of 12121223012 is 21032212121.

It can be written as a sum of positive squares in only one way, i.e., 8140370176 + 3980852836 = 90224^2 + 63094^2 .

It is not an unprimeable number, because it can be changed into a prime (12121223011) 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 as a sum of consecutive naturals, namely, 1515152873 + ... + 1515152880.

It is an arithmetic number, because the mean of its divisors is an integer number (3535356713).

Almost surely, 2^12121223012 is an apocalyptic number.

It is an amenable number.

12121223012 is a deficient number, since it is larger than the sum of its proper divisors (9090917266).

12121223012 is a wasteful number, since it uses less digits than its factorization.

12121223012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3030305757 (or 3030305755 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 12121223012 its reverse (21032212121), we get a palindrome (33153435133).

The spelling of 12121223012 in words is "twelve billion, one hundred twenty-one million, two hundred twenty-three thousand, twelve".