1321323003 has 64 divisors (see below), whose sum is σ = 2628326400. Its totient is φ = 633588480.

The previous prime is 1321323001. The next prime is 1321323041. The reversal of 1321323003 is 3003231231.

It is not a de Polignac number, because 1321323003 - 2¹ = 1321323001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1321323001) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2583 + ... + 51471.

It is an arithmetic number, because the mean of its divisors is an integer number (41067600).

Almost surely, 2^1321323003 is an apocalyptic number.

1321323003 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1321323003 is a deficient number, since it is larger than the sum of its proper divisors (1307003397).

1321323003 is a wasteful number, since it uses less digits than its factorization.

1321323003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48929 (or 48923 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 18.

The square root of 1321323003 is about 36350.0069188439. The cubic root of 1321323003 is about 1097.3276737473.

Adding to 1321323003 its reverse (3003231231), we get a palindrome (4324554234).

The spelling of 1321323003 in words is "one billion, three hundred twenty-one million, three hundred twenty-three thousand, three".