1321003213 has 4 divisors (see below), whose sum is σ = 1321515648. Its totient is φ = 1320490780.

The previous prime is 1321003171. The next prime is 1321003219. The reversal of 1321003213 is 3123001231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1321003213 - 2⁹ = 1321002701 is a prime.

It is a super-3 number, since 3×1321003213³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321003219) 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, 252331 + ... + 257512.

It is an arithmetic number, because the mean of its divisors is an integer number (330378912).

Almost surely, 2^1321003213 is an apocalyptic number.

It is an amenable number.

1321003213 is a deficient number, since it is larger than the sum of its proper divisors (512435).

1321003213 is an equidigital number, since it uses as much as digits as its factorization.

1321003213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512434.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 1321003213 is about 36345.6078914633. The cubic root of 1321003213 is about 1097.2391405803.

Adding to 1321003213 its reverse (3123001231), we get a palindrome (4444004444).

The spelling of 1321003213 in words is "one billion, three hundred twenty-one million, three thousand, two hundred thirteen".