1321012003 has 4 divisors (see below), whose sum is σ = 1321118568. Its totient is φ = 1320905440.

The previous prime is 1321011971. The next prime is 1321012019. The reversal of 1321012003 is 3002101231.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1321012003 - 2⁵ = 1321011971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321012103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31801 + ... + 60442.

It is an arithmetic number, because the mean of its divisors is an integer number (330279642).

Almost surely, 2^1321012003 is an apocalyptic number.

1321012003 is a deficient number, since it is larger than the sum of its proper divisors (106565).

1321012003 is an equidigital number, since it uses as much as digits as its factorization.

1321012003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106564.

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

The square root of 1321012003 is about 36345.7288137134. The cubic root of 1321012003 is about 1097.2415742637.

Adding to 1321012003 its reverse (3002101231), we get a palindrome (4323113234).

The spelling of 1321012003 in words is "one billion, three hundred twenty-one million, twelve thousand, three".