1221303001001 has 4 divisors (see below), whose sum is σ = 1230919560192. Its totient is φ = 1211686441812.

The previous prime is 1221303000991. The next prime is 1221303001003. The reversal of 1221303001001 is 1001003031221.

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 1221303001001 - 2¹⁴ = 1221302984617 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1221303001003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4808279405 + ... + 4808279658.

It is an arithmetic number, because the mean of its divisors is an integer number (307729890048).

Almost surely, 2^{1221303001001} is an apocalyptic number.

It is an amenable number.

1221303001001 is a deficient number, since it is larger than the sum of its proper divisors (9616559191).

1221303001001 is an equidigital number, since it uses as much as digits as its factorization.

1221303001001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9616559190.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 1221303001001 its reverse (1001003031221), we get a palindrome (2222306032222).

The spelling of 1221303001001 in words is "one trillion, two hundred twenty-one billion, three hundred three million, one thousand, one".