1001221320223 has 4 divisors (see below), whose sum is σ = 1014936680848. Its totient is φ = 987505959600.

The previous prime is 1001221320199. The next prime is 1001221320247. The reversal of 1001221320223 is 3220231221001.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1001221320199) and next prime (1001221320247).

It is a cyclic number.

It is not a de Polignac number, because 1001221320223 - 2¹⁷ = 1001221189151 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1001221320223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001221320283) 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, 6857680203 + ... + 6857680348.

It is an arithmetic number, because the mean of its divisors is an integer number (253734170212).

Almost surely, 2^{1001221320223} is an apocalyptic number.

1001221320223 is a deficient number, since it is larger than the sum of its proper divisors (13715360625).

1001221320223 is an equidigital number, since it uses as much as digits as its factorization.

1001221320223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13715360624.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 1001221320223 its reverse (3220231221001), we get a palindrome (4221452541224).

The spelling of 1001221320223 in words is "one trillion, one billion, two hundred twenty-one million, three hundred twenty thousand, two hundred twenty-three".