1000320021221 has 4 divisors (see below), whose sum is σ = 1000333858944. Its totient is φ = 1000306183500.

The previous prime is 1000320021199. The next prime is 1000320021227. The reversal of 1000320021221 is 1221200230001.

It is a happy number.

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 1000320021221 - 2¹⁰ = 1000320020197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1000320021196 and 1000320021205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000320021227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6809855 + ... + 6955196.

It is an arithmetic number, because the mean of its divisors is an integer number (250083464736).

Almost surely, 2^{1000320021221} is an apocalyptic number.

It is an amenable number.

1000320021221 is a deficient number, since it is larger than the sum of its proper divisors (13837723).

1000320021221 is an equidigital number, since it uses as much as digits as its factorization.

1000320021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13837722.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 1000320021221 its reverse (1221200230001), we get a palindrome (2221520251222).

The spelling of 1000320021221 in words is "one trillion, three hundred twenty million, twenty-one thousand, two hundred twenty-one".