1223312131212 has 24 divisors (see below), whose sum is σ = 2946472230912. Its totient is φ = 394616816400.

The previous prime is 1223312131211. The next prime is 1223312131219. The reversal of 1223312131212 is 2121312133221.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (1223312131211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1644236364 + ... + 1644237107.

It is an arithmetic number, because the mean of its divisors is an integer number (122769676288).

Almost surely, 2^{1223312131212} is an apocalyptic number.

1223312131212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1223312131212 is an abundant number, since it is smaller than the sum of its proper divisors (1723160099700).

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

1223312131212 is a wasteful number, since it uses less digits than its factorization.

1223312131212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3288473509 (or 3288473507 counting only the distinct ones).

The product of its digits is 864, while the sum is 24.

Adding to 1223312131212 its reverse (2121312133221), we get a palindrome (3344624264433).

The spelling of 1223312131212 in words is "one trillion, two hundred twenty-three billion, three hundred twelve million, one hundred thirty-one thousand, two hundred twelve".