1312003221 has 8 divisors (see below), whose sum is σ = 1753398144. Its totient is φ = 872638560.

The previous prime is 1312003211. The next prime is 1312003223. The reversal of 1312003221 is 1223002131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1312003221 - 2⁷ = 1312003093 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1312003221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312003223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 506056 + ... + 508641.

It is an arithmetic number, because the mean of its divisors is an integer number (219174768).

Almost surely, 2^1312003221 is an apocalyptic number.

It is an amenable number.

1312003221 is a deficient number, since it is larger than the sum of its proper divisors (441394923).

1312003221 is a wasteful number, since it uses less digits than its factorization.

1312003221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1015131.

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

The square root of 1312003221 is about 36221.5850150156. The cubic root of 1312003221 is about 1094.7416308329.

Adding to 1312003221 its reverse (1223002131), we get a palindrome (2535005352).

It can be divided in two parts, 131200 and 3221, that added together give a triangular number (134421 = T₅₁₈).

The spelling of 1312003221 in words is "one billion, three hundred twelve million, three thousand, two hundred twenty-one".