1321221003 has 8 divisors (see below), whose sum is σ = 1764886416. Its totient is φ = 879184800.

The previous prime is 1321220987. The next prime is 1321221061. The reversal of 1321221003 is 3001221231.

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

It is not a de Polignac number, because 1321221003 - 2⁴ = 1321220987 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1321221103) 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, 405408 + ... + 408653.

It is an arithmetic number, because the mean of its divisors is an integer number (220610802).

Almost surely, 2^1321221003 is an apocalyptic number.

1321221003 is a deficient number, since it is larger than the sum of its proper divisors (443665413).

1321221003 is an equidigital number, since it uses as much as digits as its factorization.

1321221003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 814605.

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

The square root of 1321221003 is about 36348.6038658983. The cubic root of 1321221003 is about 1097.2994368205.

Adding to 1321221003 its reverse (3001221231), we get a palindrome (4322442234).

The spelling of 1321221003 in words is "one billion, three hundred twenty-one million, two hundred twenty-one thousand, three".