1231211022012 has 72 divisors (see below), whose sum is σ = 3148684222320. Its totient is φ = 405600602880.

The previous prime is 1231211022001. The next prime is 1231211022017. The reversal of 1231211022012 is 2102201121321.

1231211022012 is a `hidden beast` number, since 1 + 231 + 211 + 0 + 220 + 1 + 2 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231211022017) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6770023 + ... + 6949505.

It is an arithmetic number, because the mean of its divisors is an integer number (43731725310).

Almost surely, 2^{1231211022012} is an apocalyptic number.

1231211022012 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 1231211022012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1574342111160).

1231211022012 is an abundant number, since it is smaller than the sum of its proper divisors (1917473200308).

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

1231211022012 is a wasteful number, since it uses less digits than its factorization.

1231211022012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181723 (or 181718 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 1231211022012 its reverse (2102201121321), we get a palindrome (3333412143333).

The spelling of 1231211022012 in words is "one trillion, two hundred thirty-one billion, two hundred eleven million, twenty-two thousand, twelve".