1321002312 has 128 divisors (see below), whose sum is σ = 3900441600. Its totient is φ = 364992768.

The previous prime is 1321002307. The next prime is 1321002337. The reversal of 1321002312 is 2132001231.

1321002312 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 1321002291 and 1321002300.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 772114 + ... + 773822.

It is an arithmetic number, because the mean of its divisors is an integer number (30472200).

Almost surely, 2^1321002312 is an apocalyptic number.

1321002312 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 1321002312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1950220800).

1321002312 is an abundant number, since it is smaller than the sum of its proper divisors (2579439288).

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

1321002312 is a wasteful number, since it uses less digits than its factorization.

1321002312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1875 (or 1871 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1321002312 is about 36345.5954965660. The cubic root of 1321002312 is about 1097.2388911203.

Adding to 1321002312 its reverse (2132001231), we get a palindrome (3453003543).

The spelling of 1321002312 in words is "one billion, three hundred twenty-one million, two thousand, three hundred twelve".