1321003012 has 48 divisors (see below), whose sum is σ = 2737445760. Its totient is φ = 545755392.

The previous prime is 1321003001. The next prime is 1321003049. The reversal of 1321003012 is 2103001231.

It is a junction number, because it is equal to n+sod(n) for n = 1321002983 and 1321003001.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 890023 + ... + 891505.

It is an arithmetic number, because the mean of its divisors is an integer number (57030120).

Almost surely, 2^1321003012 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 1321003012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1368722880).

1321003012 is an abundant number, since it is smaller than the sum of its proper divisors (1416442748).

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

1321003012 is a wasteful number, since it uses less digits than its factorization.

1321003012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2620 (or 2618 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 1321003012 is about 36345.6051263423. The cubic root of 1321003012 is about 1097.2390849294.

Adding to 1321003012 its reverse (2103001231), we get a palindrome (3424004243).

The spelling of 1321003012 in words is "one billion, three hundred twenty-one million, three thousand, twelve".