1321020201003 has 16 divisors (see below), whose sum is σ = 1774695014400. Its totient is φ = 874016225856.

The previous prime is 1321020200831. The next prime is 1321020201043. The reversal of 1321020201003 is 3001020201231.

It is not a de Polignac number, because 1321020201003 - 2³⁰ = 1319946459179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1321020201043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1100598 + ... + 1962996.

It is an arithmetic number, because the mean of its divisors is an integer number (110918438400).

Almost surely, 2^{1321020201003} is an apocalyptic number.

1321020201003 is a deficient number, since it is larger than the sum of its proper divisors (453674813397).

1321020201003 is a wasteful number, since it uses less digits than its factorization.

1321020201003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 866266.

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

Adding to 1321020201003 its reverse (3001020201231), we get a palindrome (4322040402234).

The spelling of 1321020201003 in words is "one trillion, three hundred twenty-one billion, twenty million, two hundred one thousand, three".