1001001022221 has 8 divisors (see below), whose sum is σ = 1334672841760. Its totient is φ = 667331608752.

The previous prime is 1001001022181. The next prime is 1001001022297. The reversal of 1001001022221 is 1222201001001.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1001001022221 - 2¹⁸ = 1001000760077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1001001022197 and 1001001022206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001001023221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 916515 + ... + 1685823.

It is an arithmetic number, because the mean of its divisors is an integer number (166834105220).

Almost surely, 2^{1001001022221} is an apocalyptic number.

It is an amenable number.

1001001022221 is a deficient number, since it is larger than the sum of its proper divisors (333671819539).

1001001022221 is an equidigital number, since it uses as much as digits as its factorization.

1001001022221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1203035.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 1001001022221 its reverse (1222201001001), we get a palindrome (2223202023222).

The spelling of 1001001022221 in words is "one trillion, one billion, one million, twenty-two thousand, two hundred twenty-one".