1001320012 has 72 divisors (see below), whose sum is σ = 2210298272. Its totient is φ = 388523520.

The previous prime is 1001319989. The next prime is 1001320013. The reversal of 1001320012 is 2100231001.

It is not an unprimeable number, because it can be changed into a prime (1001320013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1141318 + ... + 1142194.

Almost surely, 2^1001320012 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1001320012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1105149136).

1001320012 is an abundant number, since it is smaller than the sum of its proper divisors (1208978260).

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

1001320012 is a wasteful number, since it uses less digits than its factorization.

1001320012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1247 (or 1234 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 1001320012 is about 31643.6409409537. The cubic root of 1001320012 is about 1000.4398105383.

Adding to 1001320012 its reverse (2100231001), we get a palindrome (3101551013).

The spelling of 1001320012 in words is "one billion, one million, three hundred twenty thousand, twelve".