1323111021012 has 72 divisors (see below), whose sum is σ = 3649755826080. Its totient is φ = 400813398720.

The previous prime is 1323111021007. The next prime is 1323111021017. The reversal of 1323111021012 is 2101201113231.

1323111021012 is a `hidden beast` number, since 132 + 311 + 1 + 0 + 210 + 12 = 666.

It is an interprime number because it is at equal distance from previous prime (1323111021007) and next prime (1323111021017).

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 (1323111021017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 693823 + ... + 1768505.

It is an arithmetic number, because the mean of its divisors is an integer number (50691053140).

Almost surely, 2^{1323111021012} is an apocalyptic number.

1323111021012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1323111021012 is an abundant number, since it is smaller than the sum of its proper divisors (2326644805068).

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

1323111021012 is a wasteful number, since it uses less digits than its factorization.

1323111021012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1077813 (or 1077808 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 1323111021012 its reverse (2101201113231), we get a palindrome (3424312134243).

The spelling of 1323111021012 in words is "one trillion, three hundred twenty-three billion, one hundred eleven million, twenty-one thousand, twelve".