1000323021221 has 4 divisors (see below), whose sum is σ = 1009175437452. Its totient is φ = 991470604992.

The previous prime is 1000323021211. The next prime is 1000323021223. The reversal of 1000323021221 is 1221203230001.

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

It can be written as a sum of positive squares in 2 ways, for example, as 239522148100 + 760800873121 = 489410^2 + 872239^2 .

It is a cyclic number.

It is not a de Polignac number, because 1000323021221 - 2⁶ = 1000323021157 is a prime.

It is a super-2 number, since 2×1000323021221² (a number of 25 digits) contains 22 as substring.

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 1000323021221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000323021223) 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, 4426207946 + ... + 4426208171.

It is an arithmetic number, because the mean of its divisors is an integer number (252293859363).

Almost surely, 2^{1000323021221} is an apocalyptic number.

It is an amenable number.

1000323021221 is a deficient number, since it is larger than the sum of its proper divisors (8852416231).

1000323021221 is an equidigital number, since it uses as much as digits as its factorization.

1000323021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8852416230.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 1000323021221 its reverse (1221203230001), we get a palindrome (2221526251222).

The spelling of 1000323021221 in words is "one trillion, three hundred twenty-three million, twenty-one thousand, two hundred twenty-one".