1000321321221 has 12 divisors (see below), whose sum is σ = 1498423707872. Its totient is φ = 666880880652.

The previous prime is 1000321321201. The next prime is 1000321321247. The reversal of 1000321321221 is 1221231230001.

1000321321221 is a `hidden beast` number, since 1 + 0 + 0 + 0 + 321 + 321 + 2 + 21 = 666.

It is not a de Polignac number, because 1000321321221 - 2⁵ = 1000321321189 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1000321321194 and 1000321321203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000321321201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2058274081 + ... + 2058274566.

Almost surely, 2^{1000321321221} is an apocalyptic number.

It is an amenable number.

1000321321221 is a deficient number, since it is larger than the sum of its proper divisors (498102386651).

1000321321221 is an frugal number, since it uses more digits than its factorization.

1000321321221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4116548662 (or 4116548650 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 1000321321221 its reverse (1221231230001), we get a palindrome (2221552551222).

The spelling of 1000321321221 in words is "one trillion, three hundred twenty-one million, three hundred twenty-one thousand, two hundred twenty-one".