1321355603 has 8 divisors (see below), whose sum is σ = 1357558272. Its totient is φ = 1285490056.

The previous prime is 1321355597. The next prime is 1321355657. The reversal of 1321355603 is 3065531231.

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

It is a cyclic number.

It is not a de Polignac number, because 1321355603 - 2¹⁴ = 1321339219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321355003) 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, 76325 + ... + 92022.

It is an arithmetic number, because the mean of its divisors is an integer number (169694784).

Almost surely, 2^1321355603 is an apocalyptic number.

1321355603 is a deficient number, since it is larger than the sum of its proper divisors (36202669).

1321355603 is a wasteful number, since it uses less digits than its factorization.

1321355603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168561.

The product of its (nonzero) digits is 8100, while the sum is 29.

The square root of 1321355603 is about 36350.4553341495. The cubic root of 1321355603 is about 1097.3366981842.

Adding to 1321355603 its reverse (3065531231), we get a palindrome (4386886834).

The spelling of 1321355603 in words is "one billion, three hundred twenty-one million, three hundred fifty-five thousand, six hundred three".