12311220212 has 36 divisors (see below), whose sum is σ = 22754651556. Its totient is φ = 5827176960.

The previous prime is 12311220203. The next prime is 12311220217. The reversal of 12311220212 is 21202211321.

It can be written as a sum of positive squares in 2 ways, for example, as 3625725796 + 8685494416 = 60214^2 + 93196^2 .

It is a super-2 number, since 2×12311220212² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12311220217) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 175262 + ... + 235242.

Almost surely, 2^12311220212 is an apocalyptic number.

It is an amenable number.

12311220212 is a deficient number, since it is larger than the sum of its proper divisors (10443431344).

12311220212 is a wasteful number, since it uses less digits than its factorization.

12311220212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60128 (or 60103 counting only the distinct ones).

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

Adding to 12311220212 its reverse (21202211321), we get a palindrome (33513431533).

The spelling of 12311220212 in words is "twelve billion, three hundred eleven million, two hundred twenty thousand, two hundred twelve".