1231123212 has 180 divisors, whose sum is σ = 3655299648. Its totient is φ = 360676800.

The previous prime is 1231123211. The next prime is 1231123219. The reversal of 1231123212 is 2123211321.

It is a Harshad number since it is a multiple of its sum of digits (18).

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 (1231123211) by changing a digit.

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 59 ways as a sum of consecutive naturals, for example, 1214818 + ... + 1215830.

Almost surely, 2^1231123212 is an apocalyptic number.

1231123212 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 1231123212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1827649824).

1231123212 is an abundant number, since it is smaller than the sum of its proper divisors (2424176436).

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

1231123212 is a wasteful number, since it uses less digits than its factorization.

1231123212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1082 (or 1060 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 1231123212 is about 35087.3654183383. The cubic root of 1231123212 is about 1071.7673102201.

Adding to 1231123212 its reverse (2123211321), we get a palindrome (3354334533).

The spelling of 1231123212 in words is "one billion, two hundred thirty-one million, one hundred twenty-three thousand, two hundred twelve".