1321031012 has 24 divisors (see below), whose sum is σ = 2781119040. Its totient is φ = 536358240.

The previous prime is 1321031011. The next prime is 1321031039. The reversal of 1321031012 is 2101301231.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is not an unprimeable number, because it can be changed into a prime (1321031011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1241039 + ... + 1242102.

It is an arithmetic number, because the mean of its divisors is an integer number (115879960).

Almost surely, 2^1321031012 is an apocalyptic number.

It is an amenable number.

1321031012 is an abundant number, since it is smaller than the sum of its proper divisors (1460088028).

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

1321031012 is a wasteful number, since it uses less digits than its factorization.

1321031012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2483171 (or 2483169 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 1321031012 is about 36345.9903153016. The cubic root of 1321031012 is about 1097.2468372401.

Adding to 1321031012 its reverse (2101301231), we get a palindrome (3422332243).

The spelling of 1321031012 in words is "one billion, three hundred twenty-one million, thirty-one thousand, twelve".